Los Osos High

Summary:

Los Osos High is a public high school located in Rancho Cucamonga, California, serving grades 9-12 with a total enrollment of 2,837 students. The school is part of the Chaffey Joint Union High School District, which is ranked 375 out of 1,568 districts in California and has a 4-star rating from SchoolDigger.

Los Osos High consistently outperforms the Chaffey Joint Union High School District and the state of California in standardized test scores, with 81.78% of 11th-grade students proficient or better in English Language Arts/Literacy, compared to 67.04% for the district and 55.73% for the state. In Mathematics, 48.61% of 11th-grade students were proficient or better, compared to 31.74% for the district and 27.9% for the state. The school also maintains a high four-year graduation rate, ranging from 94.8% to 95.9% over the past five years, outperforming the district and state averages. Additionally, Los Osos High has demonstrated strong performance across various student subgroups, ranking highly in the state for Asian, African American, Hispanic, and Low Socioeconomic Status students.

While Los Osos High is a high-performing school, the data suggests that English Language Learner and Disabled students may face greater challenges, with lower rankings and performance compared to other subgroups. Additionally, the school has seen a significant increase in chronic absenteeism rates during the COVID-19 pandemic, from 7.7% in 2017-2018 to 35.9% in 2020-2021, which is a concern that the school and district should closely monitor and address. Overall, Los Osos High stands out as a strong educational option within the Chaffey Joint Union High School District, with its proximity to other high-quality institutions in the area suggesting a robust educational environment.


Detail:

Public 9-12

 6001 Milliken Ave.
       Rancho Cucamonga, CA  91737-7709


(909) 477-6900

District: Chaffey Joint Union High

SchoolDigger Rank:
189th of 2,323 California High Schools

Per Pupil Expenditures:  $8,728 Help


Feeder schools for Los Osos High:

Elementary:    Banyan Elementary
    Caryn Elementary
    Deer Canyon Elementary
    Floyd M. Stork Elementary
    More...
Middle:    Alta Loma Junior High
    Day Creek Intermediate
    Vineyard Junior High

Student/teacher ratio:  24.7 Help
Number of students:  2,837

Racial breakdown:

Hispanic:
39.4%
White:
28.0%
Asian:
22.3%
more

Free/discounted lunch recipients:  29% Help


 See top rated California high schools

 Compare Los Osos High to nearby high schools!

Performance Trends
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Compare Details Los Osos High ranks better than 91.9% of high schools in California. It also ranks 2nd among 10 ranked high schools in the Chaffey Joint Union High School District. (See more...)
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Compare Details In 2024 the calculated Average Standard Score was 88.67. (See more...)
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The Adjusted Cohort Graduation Rate (ACGR) measures the percentage of Los Osos High freshmen who graduate within four years, adjusting for students who transfer in or out.
Help
The high school dropout rate measures the percentage of students who do not complete their high school education.
Help
Chronic absenteeism in a high school refers to a situation where students repeatedly miss school, with the threshold often defined as missing 10% or more of school days for any reason, excused or unexcused.
Student Body
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Compare Details Student population at Los Osos High is diverse. Racial makeup is: Hispanic (39.4%), White (28%), Asian (22.3%). (See more...)
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Compare Details 29% of students are receiving a free or discounted lunch. This is the lowest percentage in the Chaffey Joint Union High School District. (See more...)
Teachers
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Compare Details The student/teacher ratio at Los Osos High is 24.7. 8 high schools in the Chaffey Joint Union High School District have better student/teacher ratios. (See more...)
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Compare Los Osos High employs 114.5 full-time teachers.
Finance
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Compare Details The average total spent per student at Los Osos High is $8,728. 8 high schools in the Chaffey Joint Union High School District spend more per student.
Schooldigger 2024 Rankings:

Los Osos High:

SchoolDigger ranks Los Osos High 189th of 2323 California public high schools. (See Los Osos High in the ranking list.)

High School Test Score Ratings by Student Subgroup:


Multi-racial students:
English Language Learner students:
Special Education students:
Low Socio Economic Status students:
Homeless students:
Female students:
Military Connected students:
Male students:
Asian students:
African American students:
Hispanic students:
White students:


Chaffey Joint Union High:

SchoolDigger ranks Chaffey Joint Union High 375th of 1568 California school districts. (See district ranking list.)


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Rank History for Los Osos High

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Compare

Rank History for all students at Los Osos High

Year Avg Standard Score Statewide Rank Total # Ranked High Schools CA State Percentile SchoolDigger Rating
2004 68.86 210th 1653 87.3%
2005 75.49 156th 1901 91.8%
2006 79.38 125th 1968 93.6%
2007 87.37 51st 2063 97.5%
2008 83.38 84th 2117 96.0%
2009 81.54 91st 2238 95.9%
2010 82.89 96th 2281 95.8%
2011 81.90 115th 2367 95.1%
2012 81.84 119th 2354 94.9%
2013 83.18 97th 2426 96.0%
2015 87.31 229th 1994 88.5%
2016 88.55 221st 2039 89.2%
2017 85.39 306th 2021 84.9%
2018 90.05 200th 2017 90.1%
2019 87.14 235th 2133 89.0%
2021 89.42 136th 1290 89.5%
2022 88.86 215th 2123 89.9%
2023 89.05 194th 2348 91.7%
2024 88.67 189th 2323 91.9%
See the entire list of California High School Rankings!

Rank History for Multi-racial students at Los Osos High

Year Avg Standard Score Statewide Rank Total # Ranked High Schools CA State Percentile SchoolDigger Rating
2018 65.56 137th 366 62.6%
2019 33.54 299th 422 29.1%
2022 73.52 123rd 515 76.1%
2023 65.14 217th 786 72.4%
2024 66.84 200th 804 75.1%
See the entire list of Best California High Schools for Multi-racial Students!

Rank History for English Language Learner students at Los Osos High

Year Avg Standard Score Statewide Rank Total # Ranked High Schools CA State Percentile SchoolDigger Rating
2018 99.35 17th 938 98.2%
2021 95.80 14th 467 97.0%
2022 100.00 2nd 1044 99.8%
2023 91.23 15th 1323 98.9%
2024 32.10 741st 1350 45.1%
See the entire list of Best California High Schools for English Language Learner Students!

Rank History for Special Education students at Los Osos High

Year Avg Standard Score Statewide Rank Total # Ranked High Schools CA State Percentile SchoolDigger Rating
2023 54.26 397th 1547 74.3%
2024 57.59 359th 1534 76.6%
See the entire list of Best California High Schools for Special Education Students!

Rank History for Low Socio Economic Status students at Los Osos High

Year Avg Standard Score Statewide Rank Total # Ranked High Schools CA State Percentile SchoolDigger Rating
2018 90.59 155th 1862 91.7%
2019 82.97 239th 1937 87.7%
2021 90.16 85th 1126 92.5%
2022 89.98 150th 1943 92.3%
2023 91.16 132nd 2247 94.1%
2024 92.86 94th 2235 95.8%
See the entire list of Best California High Schools for Low Socio Economic Status Students!

Rank History for Homeless students at Los Osos High

Year Avg Standard Score Statewide Rank Total # Ranked High Schools CA State Percentile SchoolDigger Rating
2022 82.61 29th 290 90.0%
2023 74.30 70th 417 83.2%
2024 79.07 60th 451 86.7%
See the entire list of Best California High Schools for Homeless Students!

Rank History for Female students at Los Osos High

Year Avg Standard Score Statewide Rank Total # Ranked High Schools CA State Percentile SchoolDigger Rating
2018 88.59 185th 1760 89.5%
2019 83.06 275th 1833 85.0%
2021 89.76 103rd 1054 90.2%
2022 88.71 199th 1858 89.3%
2023 87.75 189th 2118 91.1%
2024 85.93 206th 2098 90.2%
See the entire list of Best California High Schools for Female Students!

Rank History for Disabled students at Los Osos High

Year Avg Standard Score Statewide Rank Total # Ranked High Schools CA State Percentile SchoolDigger Rating
2018 75.00 170th 1052 83.8%
2019 70.01 207th 1117 81.5%
2021 88.79 44th 555 92.1%
2022 52.79 360th 1161 69.0%
See the entire list of Best California High Schools for Disabled Students!

Rank History for Military Connected students at Los Osos High

Year Avg Standard Score Statewide Rank Total # Ranked High Schools CA State Percentile SchoolDigger Rating
2023 60.40 80th 233 65.7%
2024 78.06 38th 234 83.8%
See the entire list of Best California High Schools for Military Connected Students!

Rank History for Male students at Los Osos High

Year Avg Standard Score Statewide Rank Total # Ranked High Schools CA State Percentile SchoolDigger Rating
2018 88.87 202nd 1834 89.0%
2019 86.83 215th 1880 88.6%
2021 86.25 166th 1122 85.2%
2022 86.98 222nd 1916 88.4%
2023 88.12 191st 2207 91.3%
2024 88.66 172nd 2172 92.1%
See the entire list of Best California High Schools for Male Students!

Rank History for Asian students at Los Osos High

Year Avg Standard Score Statewide Rank Total # Ranked High Schools CA State Percentile SchoolDigger Rating
2018 75.58 155th 581 73.3%
2019 74.73 147th 582 74.7%
2022 76.72 139th 581 76.1%
2023 74.29 178th 731 75.6%
2024 76.48 148th 712 79.2%
See the entire list of Best California High Schools for Asian Students!

Rank History for African American students at Los Osos High

Year Avg Standard Score Statewide Rank Total # Ranked High Schools CA State Percentile SchoolDigger Rating
2018 81.10 102nd 582 82.5%
2019 64.67 155th 592 73.8%
2022 80.50 73rd 522 86.0%
2023 82.62 87th 720 87.9%
2024 80.89 93rd 721 87.1%
See the entire list of Best California High Schools for African American Students!

Rank History for Hispanic students at Los Osos High

Year Avg Standard Score Statewide Rank Total # Ranked High Schools CA State Percentile SchoolDigger Rating
2018 86.57 199th 1742 88.6%
2019 82.91 213th 1814 88.3%
2022 88.09 149th 1861 92.0%
2023 85.96 160th 2142 92.5%
2024 89.38 111th 2125 94.8%
See the entire list of Best California High Schools for Hispanic Students!

Rank History for White students at Los Osos High

Year Avg Standard Score Statewide Rank Total # Ranked High Schools CA State Percentile SchoolDigger Rating
2018 81.82 195th 1173 83.4%
2019 73.62 276th 1222 77.4%
2022 71.12 311th 1204 74.2%
2023 74.64 244th 1434 83.0%
2024 67.95 341st 1406 75.7%
See the entire list of Best California High Schools for White Students!

Data source: test scores: California Department of Education, rankings: SchoolDigger.com

As you review the school rankings data, please be aware that some of the information from certain demographics is missing. The reason for this omission is that the data has been redacted from the source data itself due to low population samples in these specific demographic groups.

Redacting data from low population samples is a necessary step to ensure the reliability and accuracy of the results, as small sample sizes may not be representative of the broader population. Additionally, this measure helps protect the privacy of individuals belonging to these demographic groups.

Los Osos High Test Scores
Tests: 
  
Grades: 
  
Years: 
  
Group by: 
District Scores:
State Scores:    
  
Subgroup: 





Data source: California Department of Education

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Enrollment information for Los Osos High

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Year White African American Asian Hispanic American Indian Pacific Islander Two or More Races Not Specified Total
2002 867 131 101 325 5 n/a n/a 12 1441
2003 867 131 101 325 5 n/a n/a 12 1441
2004 1275 213 161 504 8 n/a n/a 108 2269
2005 1698 292 244 682 8 n/a n/a 125 3049
2006 1751 298 296 791 8 n/a n/a 116 3260
2007 1562 298 322 812 7 n/a n/a 138 3139
2008 1509 332 324 787 5 n/a n/a 0 2957
2009 1457 349 360 834 6 15 187 0 3208
2010 1424 358 395 989 8 18 70 0 3262
2011 1434 381 413 1032 9 20 76 0 3365
2012 1328 352 448 1031 12 12 67 0 3250
2013 1292 331 460 1072 12 8 58 0 3233
2014 1268 314 432 1059 10 8 59 0 3150
2015 1258 274 490 1107 14 18 50 0 3211
2016 1200 258 534 1119 14 18 55 0 3198
2017 1137 220 570 1090 15 16 56 0 3104
2018 1096 218 619 1120 13 14 73 0 3153
2019 1030 218 614 1095 15 15 65 0 3052
2020 991 195 613 1071 10 16 74 0 2970
2021 936 180 629 1102 14 14 79 0 2954
2022 867 169 594 1120 14 8 92 3 2867
2023 794 178 632 1117 13 6 96 1 2837

Data source: National Center for Education Statistics, U.S. Dept of Education.

About Enrollment/Ethnicity

For more information about how the Department of Education defines ethnicity, see Defining Race and Ethnicity Data, National Center for Education Statistics

Students eligible for free or discounted lunch at Los Osos High

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Compare
Year # Students Full-time Teachers Student/Teacher ratio % Free/Discounted Lunch
2002 1441 61.9 23.3 7.1
2003 1441 61.9 23.3 7.1
2004 2269 90.2 25.2 7.2
2005 3049 119.9 25.4 3.9
2006 3260 125.4 26.0 7.3
2007 3139 122.3 25.7 9.6
2008 2957 133.5 22.1 8
2009 3208 118.8 23.6 10.7
2010 3262 117.0 27.8 13.3
2011 3365 n/a n/a 17.6
2012 3250 113.4 28.6 n/a
2013 3233 116.7 27.6 24.3
2014 3150 115.1 27.3 26.3
2015 3211 115.0 27.9 25.8
2016 3198 116.0 27.5 32.6
2017 3104 118.0 26.2 30.9
2018 3153 121.3 25.9 33.3
2019 3052 123.2 24.7 34.2
2020 2970 n/a n/a 32.7
2021 2954 117.1 25.2 33.9
2022 2867 115.1 24.9 28.1
2023 2837 114.5 24.7 29

Data source: National Center for Education Statistics, U.S. Dept of Education.

About Students eligible for discounted/free lunch:

The National School Lunch Program (NSLP) provides low-cost or free meals to students in U.S. public and nonprofit private schools based on household income. Those with incomes below 130% of the poverty line receive free lunch, while those between 130% and 185% qualify for reduced-price lunch. The percentage of students receiving free or reduced-price lunch serves as a marker for poverty, as it reflects the socioeconomic status of families in a given school or district. A higher FRPL rate typically indicates a higher concentration of low-income families, suggesting that the school or district may face additional challenges in providing adequate resources and support for student success.

Student/Teacher Ratio Los Osos High

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Compare
Year # Students Full-time Teachers Student/Teacher ratio % Free/Discounted Lunch
2002 1441 61.9 23.3 7.1
2003 1441 61.9 23.3 7.1
2004 2269 90.2 25.2 7.2
2005 3049 119.9 25.4 3.9
2006 3260 125.4 26.0 7.3
2007 3139 122.3 25.7 9.6
2008 2957 133.5 22.1 8
2009 3208 118.8 23.6 10.7
2010 3262 117.0 27.8 13.3
2011 3365 n/a n/a 17.6
2012 3250 113.4 28.6 n/a
2013 3233 116.7 27.6 24.3
2014 3150 115.1 27.3 26.3
2015 3211 115.0 27.9 25.8
2016 3198 116.0 27.5 32.6
2017 3104 118.0 26.2 30.9
2018 3153 121.3 25.9 33.3
2019 3052 123.2 24.7 34.2
2020 2970 n/a n/a 32.7
2021 2954 117.1 25.2 33.9
2022 2867 115.1 24.9 28.1
2023 2837 114.5 24.7 29

Data source: National Center for Education Statistics, U.S. Dept of Education.

About Student-Teacher Ratio

Student/teacher ratio is calculated by dividing the total number of students by the total number of full-time equivalent teachers. Please note that a smaller student/teacher ratio does not necessarily translate to smaller class size. In some instances, schools hire teachers part time, and some teachers are hired for specialized instruction with very small class sizes. These and other factors contribute to the student/teacher ratio. Note: For private schools, Student/teacher ratio may not include Pre-Kindergarten.
Finances

Per Pupil Expenditures for Los Osos High

Help

YearTotal Expenditures Per Pupil
2018 $8,728

Data source: California Department of Education
Pre and Post Pandemic Data

Impact of COVID-19 on Los Osos High

The coronavirus has had a profound impact on education in America. Learning shifted online overnight, attendance numbers dwindled, and enrollment decreased. SchoolDigger.com is making it easier for you to better assess how COVID-19 has impacted your school. Through the collection of pre-pandemic (2019) and current data, SchoolDigger.com is sharing test scores, enrollment numbers and school demographics from schools across the country – and we make it easy to see how impacted schools compare locally and statewide.

Rankings

Rank
Pre-pandemic (2018-2019)
Rank
Post pandemic (2022-2023)
Change (%)
Ranks 235th of 2133 High schoolsRanks 194th of 2348 High schools
 2.8%

Test Scores

% proficient
Pre-pandemic (2018-2019)
% proficient
Post pandemic (2022-2023)
Change (%)
11th Grade English Language Arts/Literacy (Los Osos High)81.278.8
 2.4%
   11th Grade English Language Arts/Literacy (Chaffey Joint Union High)66.467.5
 1%
   11th Grade English Language Arts/Literacy (California)57.355.4
 1.9%
11th Grade Mathematics (Los Osos High)57.851.4
 6.3%
   11th Grade Mathematics (Chaffey Joint Union High)38.434.3
 4.1%
   11th Grade Mathematics (California)32.227.4
 4.9%
12th Grade Science (Los Osos High)30.443.9
 13.5%
   12th Grade Science (Chaffey Joint Union High)23.128.5
 5.4%
   12th Grade Science (California)25.626.9
 1.3%

Student Body

Number of students
Pre-pandemic (2018-2019)
Number of students
Post pandemic (2022-2023)
Change (%)
Total Students30522837
 7%
African American218178
 18.3%
American Indian1513
 13.3%
Asian614632
 2.9%
Hispanic10951117
 2%
Pacific Islander156
 60%
White1030794
 22.9%
Two or More Races6596
 47.7%
% Free/Discounted Lunch Recipients34.2%29%
 5.2%


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Frequently Asked Questions about Los Osos High

Yes. Los Osos High ranks in the top 8.1% of California high schools.

Students at Los Osos High are 39% Hispanic, 28% White, 22% Asian, 6% African American, 3% Two or more races.

In the 2022-23 school year, 2,837 students attended Los Osos High.


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SchoolDigger data sources: National Center for Education Statistics, U.S. Department of Education, the U.S. Census Bureau and the California Department of Education.

IMPORTANT DISCLAIMERS: Not all boundaries are included. We make every effort to ensure that boundaries are up-to-date. But it's important to note that these are approximations and are for general informational purposes only. To verify legal descriptions of boundaries or school locations, contact your local tax assessor's office and/or school district.





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