San Geronimo, CA Real Estate & Homes for Sale
By Matthew Martinez, Founder, CEO & Managing Broker, Diamond Real Estate Group. California DRE #01869679.
San Geronimo is the smallest of the San Geronimo Valley’s three Census places in Marin County, California, an unincorporated village of about 580 residents and 200 homes that also holds the Lagunitas School District campus and San Geronimo Commons, the 157-acre former golf course now in county hands. Sales are too few for a steady median; the Census Bureau’s 2020–2024 estimate of owners’ home values was $1,175,500, with a wide margin. Marin County sets the land-use rules.
- County
- Marin County
- Government
- Unincorporated (Marin County rules)
- ZIP code
- 94963
- Population
- 583 (Census ACS 2020–2024)
- Median home value
- $1,175,500 (±$414,303, ACS 2020–2024)
- Public land
- San Geronimo Commons, 157 acres
- School district
- Lagunitas School District (campus in San Geronimo)
San Geronimo homes for sale
MLS listings in San Geronimo and ZIP 94963 appear below. With only about 207 homes in the village, inventory is small, so set your property search to include neighboring Woodacre and Forest Knolls as well.
What do homes in San Geronimo sell for?
$1,175,500
2020–2024, Census ACS (±$414,303)
$830,000
August 2026, 1,605 sq ft house, Redfin
$1,678,750
Single-family, September 2026, C.A.R.
San Geronimo doesn’t produce a usable monthly median. Redfin’s ZIP 94963 page showed a $1.1 million median for the three months ending March 2026, “up 202.1%”, which tells you how few sales sit behind it. Its recent-sales list showed eight closings from April to August 2026, two of them in Woodacre. The Census estimate’s margin exceeds $400,000 either way, so treat it as a midpoint.
| Measure | Figure | Period and source |
|---|---|---|
| Median value, owner-occupied homes | $1,175,500 (±$414,303) | 2020–2024, Census ACS via Census Reporter |
| Housing units | About 207 (±99) on 1.5 square miles | 2020–2024, Census ACS |
| Median sale price, ZIP 94963 | $1.1M (small sample) | 3 months to March 2026, Redfin |
| Most recent listed sale | $830,000, 6% under list after 236 days | August 4, 2026, Redfin |
| Marin County median, single-family | $1,678,750 | September 2026, C.A.R. |
With so little to compare against, we value a San Geronimo home from the parcel outward: its position relative to the creek and the Commons, the septic record, and sales across the whole valley.
What’s happening at San Geronimo Commons, the old golf course?
The former San Geronimo golf course, at 5800 Sir Francis Drake Boulevard, is now public land called San Geronimo Commons. The Trust for Public Land held it before the county, and a 2022 easement “prohibits future development” on the land it covers while providing for creek and floodplain restoration (Trust for Public Land). The site lies beside San Geronimo Creek, contains Larsen Creek, and sits where four preserves meet: Roy’s Redwoods, French Ranch, Maurice Thorner and Gary Giacomini.
| Date | Step | Source |
|---|---|---|
| 2022 | Marin Open Space Trust secures a state-funded conservation easement barring future development on the land it covers | Trust for Public Land |
| December 13, 2022 | Supervisors approve an exclusive option to buy for $4.5 million | Trust for Public Land |
| May 21, 2024 | Ownership passes from the Trust for Public Land to the County of Marin; Marin County Parks takes over the park parcels | County of Marin |
| July 7, 2026 | First design contract for a new Marin County Fire station and headquarters on the site; expected cost $71 million | County of Marin |
| Fall 2027 (planned) | Construction starts, for about 18 months | County of Marin |
The park parcels stay open for hiking, biking and riding, limited to passive recreation. The fire campus is planned at about 25,000 square feet, with a station, training center, fleet space and crew quarters (Marin County Fire). If you’re buying near the Commons, follow the county’s project updates as the design moves beyond the Phase 1 contract approved in July 2026.
The stream rules that shape building in San Geronimo
The Center for Biological Diversity calls the valley the last undammed headwaters of the Lagunitas Creek watershed and says it holds about half of the watershed’s coho; Stanford Law School calls the watershed one of the state’s most important remaining for coho and steelhead. The Trust for Public Land says San Geronimo Creek provides roughly 40% of the watershed’s available spawning habitat.
On July 19, 2022, the Board of Supervisors unanimously adopted a Stream Conservation Area ordinance for the valley (Point Reyes Light). The ordinance, which aims for no net loss of streamside habitat, ended a dispute that began when the Salmon Protection and Watershed Network challenged the county’s 2007 Countywide Plan. The courts ruled against the county twice, most recently in April 2021, when a Superior Court judge found it hadn’t mitigated the plan’s cumulative effects on coho and steelhead (Center for Biological Diversity). The settlement also committed the county to inspections, an anonymous complaint system and more enforcement (Stanford Law School).
- What was adopted: the county says the two ordinances, which took effect August 18, 2022, create a minimum 35-foot “no touch zone” along all streams, limit residential additions to a 300-square-foot footprint, extend site plan review to development in the valley’s Stream Conservation Areas, and rezone every lot in the valley to a new combining district (County of Marin).
- How wide the protected area is: the county’s release doesn’t give the full width. The December 2021 Planning Commission draft described a buffer of 100 feet or more from the stream bank (Bay City News). Treat that as a draft figure and confirm the adopted mapping for your parcel with county planning staff.
- The debate: supporters called the rules overdue; opponents told the Point Reyes Light they would put “an unfair financial burden on 900 families in the valley.”
Before you write an offer on a San Geronimo lot near a creek, ask the county whether it’s mapped in the Stream Conservation Area and what a site assessment would cost. Plans for a second unit or a bigger footprint may need extra review there.
Rancho San Geronimo: the valley’s ranch history
San Geronimo shares its name with Rancho San Geronimo, the land grant that once covered the valley. The San Geronimo Valley Historical Society traces it from a Mission San Rafael ranching outpost to a grant to the Mexican soldier Rafael Cacho, who was in the area by 1839. Cacho transferred the rancho to Joseph W. Revere, a naval officer and grandson of Paul Revere, and the Mailliard family held it until the early 1910s, when the Lagunitas Development Company bought the land and began subdividing it.
Ranching hasn’t disappeared: the society notes that the Dickson and Ottolini family ranches still operate, and Spirit Rock’s 409-acre parcel in Woodacre is still zoned for agriculture. Check the zoning of any large parcel before you assume it can be split.
Septic, paramedics and other services in San Geronimo
- Wastewater: homes use septic systems; a 2019 county sewer study for about 360 Flats properties here and in Woodacre hasn’t gone to construction (Marin County Environmental Health). Our Woodacre page covers the county septic rules that apply.
- Paramedics: the valley sits inside County Service Area 28, which helps pay for round-the-clock paramedic coverage in West Marin (Marin County Finance). Ask the seller for the latest tax bill to see which special taxes, such as the Measure C wildfire tax, apply.
- Water: Marin Water’s service area reaches west into the San Geronimo Valley, according to Marin LAFCo. Confirm the connection for each address, and for a private well get the county permit and test results.
- Fire: during the 2018 Irving Fire, evacuees were taken to the Lagunitas School and Community Center at 1 Lagunitas School Road (Fire Safe Marin).
Renting in San Geronimo
Rental rules affect owners as much as tenants. In unincorporated Marin, the county’s just-cause eviction ordinance applies to properties with three or more units, so most single-family rentals here fall under state law instead. A rent increase above 5% in 12 months triggers the county’s mandatory mediation program. For stays of under 30 days, San Geronimo has 10 county short-term rental licenses, falling to 7 as licenses lapse, and a license ends when the house sells. Buying to rent? See our investment property services and our Marin County guide.
The school campus and community center
The Lagunitas School District, which Marin LAFCo lists as serving the unincorporated San Geronimo Valley, is based at One Lagunitas School Road in San Geronimo, with transitional kindergarten through fifth grade on the upper campus and grades 6 to 8 on the lower campus. The state lists it as Lagunitas Elementary, a K–8 district with 168 students in 2025–26 (Ed-Data). The district traces its roots to an 1872 San Geronimo School District formed for the area’s ranches, renamed Lagunitas in 1908, and lists the San Geronimo Valley Community Center among its partners.
San Geronimo Valley Drive and getting around
San Geronimo sits along two roads: Sir Francis Drake Boulevard and San Geronimo Valley Drive, which meets the boulevard near Spirit Rock in Woodacre. The Stagecoach, Marin Transit Route 68, uses both, stopping at San Geronimo Valley Drive and Creamery Road and at the school campus on its eight weekday westbound runs between San Rafael and Inverness (April 2026, Marin Transit).
San Geronimo compared with nearby areas
| Area | Size (Census ACS 2020–2024) | One verified difference |
|---|---|---|
| San Geronimo | 583 residents, 1.5 sq mi | School campus and San Geronimo Commons; 10 rental licenses, falling to 7 |
| Woodacre | 1,627 residents, 1.8 sq mi | Current county fire headquarters; Spirit Rock’s 409-acre agricultural parcel |
| Forest Knolls | Part of Lagunitas-Forest Knolls (1,626 residents, 4.2 sq mi) | 8 rental licenses, with no step-down |
| Lagunitas | Part of Lagunitas-Forest Knolls | Borders Samuel P. Taylor State Park; where the 2018 Irving Fire started |
| Nicasio | Unincorporated; in the county’s West Marin ranchlands | 11 rental licenses, falling to 8; Nicasio Reservoir is a Marin Water reservoir |
How Diamond Real Estate Group helps San Geronimo buyers
A San Geronimo purchase usually turns on three questions: can you build what you want near the creek, will the septic system carry the house, and what will the Commons look like once the fire campus is built. We get answers from the county before your contingencies run out and order inspections and insurance quotes early.
Selling in the valley? Our selling services explain pricing in a thin market. For licensed agents across the county, see our disclosed Marin County agent guide, and for how we run a purchase, our buyer services.
Selling a home in San Geronimo
San Geronimo is unincorporated Marin, so the files a buyer will want sit in county offices. Building and planning permits are with the Community Development Agency; septic and well records are with Environmental Health Services. The county’s Public Access Viewer searches each set by address or assessor’s parcel number, which makes it practical to assemble a complete file before the house goes on the market.
Creek setbacks and septic capacity
Many San Geronimo lots sit near San Geronimo Creek or a tributary. The county notes that septic work in a Stream Conservation Area can need additional permits, and buyers who picture an addition or a second unit will ask early whether the parcel is mapped. Get that answer from county planning staff before you list rather than during escrow.
Bedroom count is the other pressure point. Current county rules size a septic system at 150 gallons per day per bedroom, with a 30% reduction allowed for water-saving fixtures. If the listing advertises more bedrooms than the septic permit was designed for, expect the buyer to ask about the gap.
- Gather the septic permit plus any pumping, repair and inspection reports.
- Decide on a pre-listing evaluation: the county doesn’t mandate one at sale, but it advises buyers to request records and to get an inspector’s evaluation when records are missing.
- Confirm the water source. A house on a private well, rather than Marin Water, needs a county permit to operate it as a domestic supply, and the state Department of Water Resources holds well completion reports.
Fire, tax and statewide items
Marin County Fire’s address lookup shows whether the parcel lies in a High or Very High fire hazard zone; if it does, it points you to the request form for an AB 38 inspection, which the seller then delivers to the buyer. With no city layer, the documentary transfer tax is the county’s alone, $1.10 per $1,000; who pays is negotiable, though North Bay sellers customarily do (see the California transfer tax guide). You’ll also certify water heater bracing in writing and disclose noncompliant plumbing fixtures.
The Marin selling requirements page sets the valley beside the incorporated towns, and our seller services page explains how we prepare a listing.
Sources for this section: County of Marin Community Development Agency: Records search (Public Access Viewer); County of Marin Environmental Health Services: Septic systems program; County of Marin Environmental Health Services: Septic regulations update (LAMP); County of Marin Environmental Health Services: Wells and water systems; Marin County Fire: What is an AB-38 inspection?; Marin County Assessor-Recorder: Fees (documentary transfer tax); California Public Law: Health and Safety Code 19211 (water heater bracing); California Public Law: Civil Code 1101.4 (water-conserving plumbing fixtures).
San Geronimo real estate FAQs
Is San Geronimo a town?
No. San Geronimo is an unincorporated community, so Marin County’s Community Development Agency handles planning and permits. The Census Bureau counts it as its own place of about 583 residents.
What ZIP code is San Geronimo?
94963. The school district’s address, One Lagunitas School Road, uses it, and so do the homes Redfin lists in San Geronimo.
What happened to the San Geronimo golf course?
It’s now San Geronimo Commons, public land owned by the County of Marin since May 21, 2024. Park parcels are run by Marin County Parks for passive recreation, a 2022 conservation easement bars new development on the protected land, and Marin County Fire is designing a new headquarters there.
When will the new fire headquarters be built?
The county says construction is planned to start in fall 2027 and take about 18 months. The Board of Supervisors approved the first design contract on July 7, 2026, for a project expected to cost $71 million.
Are there houses for rent in San Geronimo?
Some, but the supply is small: the Census counts only about 207 housing units in San Geronimo. Watch listings across the valley, and note that most single-family rentals fall under state tenant law rather than the county’s just-cause ordinance, which applies to buildings of three or more units.
Does Diamond Real Estate Group manage rentals in San Geronimo?
Our work here is helping people buy and sell property, including homes bought as rentals. If you’re buying to rent, we’ll help you check the county rules and run the numbers before you commit.
What was Rancho San Geronimo?
It was the Mexican-era land grant that covered the valley, given to the soldier Rafael Cacho and later held by Joseph W. Revere and then the Mailliard family until the early 1910s, according to the San Geronimo Valley Historical Society.
Where is San Geronimo Valley Drive?
It’s a valley road running from Sir Francis Drake Boulevard near Spirit Rock in Woodacre into San Geronimo. Marin Transit Route 68 stops on it at Creamery Road.
Can I build an accessory dwelling in San Geronimo?
Possibly, but check two things first: whether the site is inside the mapped Stream Conservation Area, and whether the septic system can handle the added bedrooms. Most accessory dwellings created or legalized since 2020 also can’t be licensed as short-term rentals.
Which school district serves San Geronimo?
The Lagunitas School District, whose TK–8 campus is in San Geronimo itself. High school assignment isn’t listed on the district’s site, so confirm it with the district.
Is San Geronimo in a wildfire evacuation area?
During the 2018 Irving Fire near Samuel P. Taylor State Park, evacuation warnings went out to San Geronimo residents, and the school campus served as the evacuation center. Register with Alert Marin, and check the parcel’s fire hazard zone and AB 38 paperwork during escrow.
Sources & notes
- Census Reporter: San Geronimo, ACS 2020–2024, Redfin: ZIP 94963 (accessed October 2026) and C.A.R.: September 2026 sales report
- Trust for Public Land: San Geronimo Commons option (December 13, 2022), County of Marin: Commons in county hands (May 23, 2024) and Bay City News: county acquires former golf course (May 24, 2024)
- County of Marin: fire headquarters contract (July 7, 2026) and Marin County Fire: new headquarters
- County of Marin: Board approves policies in San Geronimo Valley (July 20, 2022), Point Reyes Light: County passes stream rules (July 20, 2022),Center for Biological Diversity (July 19, 2022), Stanford Law School (July 20, 2022) and Bay City News: draft ordinance (December 2021)
- San Geronimo Valley Historical Society, Lagunitas School District, Ed-Data: Lagunitas Elementary and Marin LAFCo profiles of the school district and Marin Water
- Marin County EHS: wastewater study (2019), Marin County: County Service Areas and Fire Safe Marin: Irving Fire (September 2018)
- Marin County CDA: short-term rental procedures (February 2025), mandatory mediation program and Marin Transit: Route 68
Figures carry their dates where they appear, and we refresh market numbers every quarter. This is general information, not legal, tax or insurance advice; confirm the rules for a specific property with the agency named. Last reviewed October 2026 by Matthew Martinez.
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Local resource: Marin County planning and township resources. Check official information for the address you are considering; area descriptions do not establish a property’s permitted uses.
