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Elementary Schools in Thermalito Union Elementary

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At a glance

DistrictThermalito Union Elementary1059^th of 1,530 California districtsFull district overview →

Schools

1,059

Students

Top rankedPlumas Avenue Elementary2962^nd of 5,817 California elementary schools

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Biggest riser

Plumas Avenue Elementary up 344 spots statewide this year

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Smallest classes

Poplar Avenue Elementary 21.3 students per teacher

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Summary:

Thermalito Union Elementary has four elementary schools: three serving kindergarten through grade 5 and one serving kindergarten only, in an area where the schools report high free/reduced lunch eligible figures for 2024–2025. In 2025–2026, the three K–5 schools averaged 34% proficient in ELA, 27% in math, and 29% in science, compared with state results of 49%, 38%, and 36%. The most important takeaway is that school results vary considerably, so a districtwide average hides meaningful differences in what families may find at each school.

Plumas Avenue Elementary stands out overall: it led ELA at 44% and science at 39%, and tied Poplar Avenue Elementary for the math lead at 33%. Plumas was the only school above the state in an all-grades subject, with science 3 percentage points higher. Its fifth-grade ELA result was especially strong: 59%, compared with 49% statewide. Poplar had the strongest third-grade ELA and math results, at 38% and 45%. Sierra Avenue Elementary had the lowest all-grades ELA and math results—25% and 16%—trailing the state by 25 and 22 points. Plumas and Poplar tied in math, 17 points above Sierra. Siskiyou Avenue Elementary serves kindergarten only and has no test scores in the supplied data.

Recent progress is mixed: the three-school averages rose 2 points in ELA, 1 point in math, and 3 points in science from 2024–2025 to 2025–2026. Plumas improved in all three subjects; Sierra’s math score fell 5 points, while Poplar’s science score fell 2 points. SchoolDigger’s statewide percentile rose from 31 to 49 for Plumas and from 18 to 33 for Poplar, while Sierra went from 15 to 13. Attendance is another notable contrast: 2025–2026 chronic absenteeism was 24% at Sierra and 25% at Siskiyou, versus 5% at Plumas and 7% at Poplar. In 2024–2025, free/reduced lunch eligible figures ranged from 84% at Poplar to 94% at Siskiyou; student-teacher ratios ranged from 21.3 at Poplar to 24.7 at Plumas among the K–5 schools. These are contextual observations, not explanations for school results.

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Ranking:

E Elementary M Middle H High A Alternative P Private

Choose columns to see: Summary School Students/Teachers Ranking Test Scores Vaccination Finance All

School													Students/Teachers											Ranking (2026)				Ranking (2025)				CAST Science (2026)			Smarter Balanced Assessments English Language Arts/Literacy (2026)							Smarter Balanced Assessments Mathematics (2026)							Vaccination (2024-25)		Per Pupil Expenditures (2025)
Name	Type	Grades	Address	City	Zip	County	District	Is Charter	Is Magnet	Is Virtual	Is Title I	Phone	Enrollment	Full-time Teachers	Student/ Teacher Ratio	Free/reduced lunch (2024-25)	White	Black	Hispanic	Asian	American Indian	Pacific Islander	Two or More Races	Average Standard Score (2026)	Statewide Rank (2026)	State Percentile (2026)	SchoolDigger Rating (2026)	Average Standard Score (2025)	Statewide Rank (2025)	State Percentile (2025)	Rank Change from Previous Year	CAST Science 5th Grade	CAST Science 8th Grade	CAST Science All Grades	Smarter Balanced Assessments English Language Arts/Literacy 3rd Grade	Smarter Balanced Assessments English Language Arts/Literacy 4th Grade	Smarter Balanced Assessments English Language Arts/Literacy 5th Grade	Smarter Balanced Assessments English Language Arts/Literacy 6th Grade	Smarter Balanced Assessments English Language Arts/Literacy 7th Grade	Smarter Balanced Assessments English Language Arts/Literacy 8th Grade	Smarter Balanced Assessments English Language Arts/Literacy All Grades	Smarter Balanced Assessments Mathematics 3rd Grade	Smarter Balanced Assessments Mathematics 4th Grade	Smarter Balanced Assessments Mathematics 5th Grade	Smarter Balanced Assessments Mathematics 6th Grade	Smarter Balanced Assessments Mathematics 7th Grade	Smarter Balanced Assessments Mathematics 8th Grade	Smarter Balanced Assessments Mathematics All Grades	Vaccination: Kindergartners with all required immunizations	Vaccination: Exemption rate	Per Pupil Expenditures Total	Sub-total from Federal Funds	Sub-total from State/Local Funds
Poplar Avenue Elementary	Public	K-5	2075 Poplar St.	Oroville	95965	Butte County	Thermalito Union Elementary	No	(n/a)	No	(n/a)	(530) 538-2910	321	15	21.3	84.4%	88 (27.4%)	3 (0.9%)	41 (12.8%)	160 (49.8%)	3 (0.9%)	1 (0.3%)	25 (7.8%)	31.4	3878^th of 5817 public elementary schools	33.3%		29	4041^st of 5857 public elementary schools	31.0%	163	23.2		23.2	38.2	29.6	30.4				32.9	45.5	34.1	19.6				32.9	≥ 95%		$20,662	$856	$19,806
Sierra Avenue Elementary	Public	K-5	1050 Sierra Ave.	Oroville	95965	Butte County	Thermalito Union Elementary	No	(n/a)	No	(n/a)	(530) 538-2920	365	17	21.4	90.4%	140 (38.4%)	7 (1.9%)	76 (20.8%)	85 (23.3%)	8 (2.2%)	2 (0.5%)	47 (12.9%)	16.7	5090^th of 5817 public elementary schools	12.5%		18.8	4931^st of 5857 public elementary schools	15.8%	159	23.8		23.8	16.4	23.7	33.3				24.6	18.0	13.6	17.5				16.4	≥ 98%		$23,961	$934	$23,027
Heritage Community Day	Public	K-8	2045 4th St.	Oroville	95965	Butte County	Thermalito Union Elementary	No	(n/a)	No	(n/a)	(530) 532-4376	5	1	4.9	—	4 (80.0%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	1 (20.0%)								(n/a)										0.0							7.1			$81,401	$96	$81,305
Plumas Avenue Elementary	Public	K-5	440 Plumas Ave.	Oroville	95965	Butte County	Thermalito Union Elementary	No	(n/a)	No	(n/a)	(530) 538-2930	322	13	24.7	87.0%	119 (37.0%)	8 (2.5%)	59 (18.3%)	99 (30.7%)	5 (1.6%)	4 (1.2%)	28 (8.7%)	44.4	2962^nd of 5817 public elementary schools	49.1%		38.6	3306^th of 5857 public elementary schools	43.6%	344	38.9		38.9	34.0	37.0	59.3				43.9	29.8	40.7	27.8				32.9	95%	0%	$21,663	$1,017	$20,646
Siskiyou Avenue Elementary	Public	K	2075 Poplar St.	Oroville	95965	Butte County	Thermalito Union Elementary	No	(n/a)	No	(n/a)	(530) 538-2910	46	3	15.3	93.5%	20 (43.5%)	1 (2.2%)	11 (23.9%)	9 (19.6%)	1 (2.2%)	0 (0.0%)	4 (8.7%)								(n/a)																		91%	0%	$22,316	$3,874	$18,442

Districts nearby

District	Distance	# of Schools	Statewide Rank
Butte County Office of Education	0.04 mi	10
Oroville Union High	0.61 mi	4	1166^th
Ipakanni Early College Charter District	1.65 mi	1
Feather Falls Union Elementary	1.65 mi	1
STREAM Charter District	2 mi	1	676^th

See the top CA California districts

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.