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Old Adobe Union

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At a glance

524^thof 1,530 California districts▲ 94

Better than 65% of California districts

Elementary 5Grades K-6

845 Crinella Dr.
Petaluma, CA 94954-4450·(707) 765-4322·All California district rankings →

Statewide performance 2017–2026

2026: better than 65.8% of districts

Schools

1,734

Students

5-star school

Top rankedSonoma Mountain Elementary287^th of 5,817 California elementary schools

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Biggest riser

Miwok Valley Elementary Charter up 1,209 spots statewide this year

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Smallest classes

Miwok Valley Elementary Charter 20.5 students per teacher

SchoolDigger ratings

5★

3★

2★

Compare California districts →See the top-ranked California schools →

Summary:

Old Adobe Union has five elementary schools serving kindergarten through grade 6, with 1,734 students total and enrollments ranging from 278 to 451. In 2025–2026, the schools’ unweighted average proficiency was 52% in ELA, 47% in math, and 41% in science—3, 9, and 5 percentage points above the state, respectively. The most important takeaway is that these averages hide a wide divide: without Sonoma Mountain Elementary, the other four schools averaged 4 points below the state in ELA, 1 point above in math, and 2 points below in science.

Sonoma Mountain Elementary led in every subject, with 80% proficiency in ELA, 77% in math, and 67% in science—31, 39, and 31 points above the state. At the other end, Miwok Valley Elementary Charter had the lowest results: 32% in ELA, 30% in math, and 20% in science, respectively 17, 8, and 16 points below the state. The gap between these two schools was 48 points in ELA, 47 in math, and 47 in science. Old Adobe Elementary Charter was a science bright spot, at 51%—second in the group and 15 points above the state.

Average results improved from 2024–2025 to 2025–2026 by 2 points in ELA, 5 in math, and 6 in science, though individual trends differed. Miwok made the largest gains in each subject—10 points in ELA, 11 in math, and 15 in science—but remained lowest overall; Loma Vista Immersion Academy’s science result fell 10 points. SchoolDigger statewide rankings rose from 84th to 95th percentile for Sonoma Mountain and from 49th to 69th for La Tercera Elementary. All five schools report free/reduced lunch eligible (FRL) figures for 2024–2025; they range from 15% at Sonoma Mountain to 65% at Miwok. These figures provide context, not an explanation of 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 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 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 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
La Tercera Elementary	Public	K-6	1600 Albin Way	Petaluma	94954	Sonoma County	Old Adobe Union	No	(n/a)	No	(n/a)	(707) 765-4303	295	13	23.6	37.3%	157 (53.2%)	8 (2.7%)	107 (36.3%)	7 (2.4%)	2 (0.7%)	2 (0.7%)	12 (4.1%)	65	1823^rd of 5817 public elementary schools	68.7%		62	1962^nd of 5857 public elementary schools	66.5%	139	42.1	42.1	52.9	52.6	55.3	67.9	57.8	47.1	34.2	34.2	54.7	43.9	≥ 98%		$20,369	$1,311	$19,058
Miwok Valley Elementary Charter	Public, Charter	K-6	1010 Saint Francis Dr.	Petaluma	94954	Sonoma County	Old Adobe Union	Yes	(n/a)	No	(n/a)	(707) 765-4304	288	14	20.5	64.6%	61 (21.2%)	8 (2.8%)	187 (64.9%)	16 (5.6%)	0 (0.0%)	0 (0.0%)	16 (5.6%)	29.3	4042^nd of 5817 public elementary schools	30.5%		15.2	5251^st of 5857 public elementary schools	10.3%	1209	20.0	20.0	31.9	31.4	43.3	25.5	32.1	40.4	42.9	23.3	14.6	30.0	≥ 95%		$22,168	$1,775	$20,393
Old Adobe Elementary Charter	Public, Charter	K-6	2856 Adobe Rd.	Petaluma	94954	Sonoma County	Old Adobe Union	Yes	(n/a)	No	(n/a)	(707) 765-4301	278	11	25.2	34.5%	192 (69.1%)	1 (0.4%)	68 (24.5%)	1 (0.4%)	0 (0.0%)	0 (0.0%)	16 (5.8%)	62.9	1937^th of 5817 public elementary schools	66.7%		61.1	2010^th of 5857 public elementary schools	65.7%	73	51.1	51.1	37.5	51.9	60.0	48.7	51.1	37.5	48.2	40.0	48.7	43.6	≥ 98%		$19,219	$1,122	$18,097
Sonoma Mountain Elementary	Public, Charter	K-6	1900 Rainier Cir.	Petaluma	94954	Sonoma County	Old Adobe Union	Yes	(n/a)	No	(n/a)	(707) 765-4305	422	17	24.8	15.4%	294 (69.7%)	1 (0.2%)	60 (14.2%)	22 (5.2%)	3 (0.7%)	0 (0.0%)	42 (10.0%)	95.5	287^th of 5817 public elementary schools	95.1%		93.3	451^st of 5857 public elementary schools	92.3%	164	66.7	66.7	87.5	83.1	73.3	78.0	80.3	87.5	84.8	70.0	66.1	76.9	≥ 98%		$18,830	$1,111	$17,719
Loma Vista Immersion Academy	Public, Charter	K-6	207 Maria Dr.	Petaluma	94954	Sonoma County	Old Adobe Union	Yes	(n/a)	No	(n/a)	(707) 765-4302	451	18	24.5	45.9%	101 (22.4%)	4 (0.9%)	329 (72.9%)	3 (0.7%)	1 (0.2%)	1 (0.2%)	12 (2.7%)	43.7	3007^th of 5817 public elementary schools	48.3%		43.1	3000^th of 5857 public elementary schools	48.8%	7	22.9	22.9	27.0	39.0	39.6	56.5	39.4	38.1	45.8	35.4	43.5	40.7	≥ 98%		$20,610	$1,238	$19,372

Districts nearby

District	Distance	# of Schools	Statewide Rank
Petaluma Joint Union High	0.6 mi	11	617^th
Petaluma City Elementary	0.61 mi	10	661^st
SBE - River Montessori Elementary Charter	1.82 mi	1
River Montessori Elementary Charter District	1.82 mi	1	261^st
Waugh Elementary	2.41 mi	2	151^st

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.