Belmont, California, sits in USDA hardiness zone 10a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
These conditions suit artichoke, meyer lemon, california poppy, and cabbage — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Belmont, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single Belmont lot. Enter your address and we'll score 1,086 plants against your land's actual soil, sun, and frost.
We read public map data around Belmont — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Belmont — the short answer
Belmont, California: USDA zone 10a, no 28°F killing freeze on record — the season is year-round, across 3K acres of city.
- USDA zone
- 10a
- USDA PHZM 2023
- Killing freeze
- None on record
- NOAA RCC ACIS 1991–2020, this town’s own record
- City area
- 3K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. The year-round finding is measured — a 30-year record with no 28°F killing freeze in it — never inferred from missing dates.
Hardiness Zone Range
Zone 10a is Belmont's average, not your lot's — a low corner or a tree line moves it. Against Belmont's no killing freeze on record, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Belmont
Each reading below is measured for Belmont itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Winter hardiness
MeasuredBelmont sits in USDA hardiness zone 10a.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
The kind of country Belmont is in
Belmont sits in the Central California Foothills and Coastal Mountains — EPA Level III, inside the wider Mediterranean California. That is read at Belmont's own centroid, and it is not what its county reads: San Mateo County is mostly Coast Range. The wider page above you is answering a different question about different ground.
What Grows in Belmont
Every plant below cleared Belmont's own zone 10a. Each card opens that plant's California profile. How we score.
Documented around Belmont
Spotted lanternfly documented 16 miles from Belmont, first recorded 2023. What to watch for.
What's on the federal record near Belmont
Closest first, within ~10 miles of Belmont. Listing isn't leaking, and distance isn't exposure.
- UDISCHES, MARTYBrownfields · 75 ft
- JOSEPHINE HORNBROOKBrownfields · 500 ft
- BELMONT SHELLUnderground Storage Tanks · 700 ft
- DRY CLEAN CITYBrownfields · 700 ft
- BELMONT SHELLBrownfields · 750 ft
- SHERWIN WILLIAMS #8692Brownfields · 750 ft
- MID-PENINSULA WATER DISTRICTPFAS · 750 ft
- SERVICE STATION - 135091Brownfields · 800 ft
- BELMONT VILLAGE CLEANERSBrownfields · 800 ft
- SAFEWAY 668Brownfields · 850 ft
- CHEVRON STATION NO 92712Brownfields · 850 ft
- BANK OF AMERICABrownfields · 850 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Belmont's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near Belmont.
Total Sites
3,672
within ~10 miles of Belmont
Risk Level
Elevated
Highest-severity
11 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Belmont
Severity Distribution
within ~10 miles of Belmont
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Belmont, Brownfields runs higher than the national average — 3,314 sites within ~10 miles of Belmont. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Brownfields: Brownfield sites are former commercial or industrial properties where legacy soil contamination (heavy metals, PAHs, petroleum compounds) may persist.
Check EPA brownfield remediation status — many sites have completed cleanup with institutional controls.
Check your specific parcel in Belmont
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the Belmont average
Your land is one point inside Belmont
Everything above resolves to Belmont as a whole — one PHZM band and one 28°F frost record, read across 3K acres. Your parcel is one point inside that footprint. Slope, tree cover, a low spot that pools cold air, and what is in the soil are all resolved at the address, and none of them are visible at city scale. That is the honest boundary of this page, and the reason the next step is a reading of your own ground rather than a better local average.
Your Lot vs the Belmont Average
Belmont Average
- ●USDA Zones 10a, averaged across Belmont
- ●One soil character for all of Belmont
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not Belmont's 10a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Belmont
Pull a site-specific report for your exact address in Belmont, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Belmont averages can't show:
We read public map data around Belmont — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Belmont average
How we know this about Belmont
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals, with the labelled statewide window where none resolves; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at city grain anywhere on this page — there is no city-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about Belmont
Is it too late to plant in Belmont?
No — Belmont has no 28°F killing freeze in the 30-year station record, so the growing season is year-round and there is no last-frost date to wait for. Planting is paced by rainfall, heat and daylength instead of by frost: start heat-lovers any month, and time cool-season crops (lettuce, brassicas, peas) for the cooler, wetter half of the year or for higher ground. Succession sowing every few weeks works all year, so the limit is what you can keep watered and harvested, not the calendar.
When does frost risk typically end in Belmont?
It doesn't — Belmont records no 28°F killing freeze at all across the 1991–2020 station record, so there is no spring frost date to plant after. Cold still matters with elevation: the higher you garden, the cooler the nights, and a few tropical crops sulk below about 60°F even where they never freeze.
How long is the growing season in Belmont?
Year-round — the 1991–2020 station record for Belmont contains no 28°F killing freeze, so there is no season to measure between freezes. What paces planting instead is heat, rainfall and daylength: the hottest, wettest stretch is the hard part for cool-season crops, not winter. Elevation is the one real exception — the higher you garden, the colder the nights get.
Is the soil safe to grow vegetables in Belmont?
The federal record around Belmont is a meaningful one — 3,672 documented sites, mostly Brownfields entries (3,314), the nearest Brownfields record under a tenth of a mile out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
Everything above is measured at Belmont's scale — its 10a band and its no killing freeze on record. Your yard writes its own version of Belmont's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at Belmont’s own scale
7 of the readings below were taken at Belmont's own scale — the 2,963 acres it covers and 3,672 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Belmont's own USDA hardiness band, zones 10aUSDA PHZM 2023
- No 28°F killing freeze in the 30-year station record covering Belmont — a year-round growing seasonNOAA Regional Climate Centers ACIS, 1991-2020
- 3,672 documented contamination sites on the federal record near Belmont, the closest Brownfields record under a tenth of a mile out from the town centreFederal environmental registers
- Belmont's boundary and the 2,963 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear Belmont's hardiness zoneGrowable Ground crop-matching engine
- Belmont sits in the Central California Foothills and Coastal Mountains — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Belmontlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Belmont's 2,963 acres read through its county's SSURGO summaryfrom San Mateo County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom San Mateo County
- The growing challenges every California grower plans around — written at state scale, so they stay on the state guidefrom California
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom San Mateo County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Belmont's 2,963 acreswhy one lot differs from the next →
- Which side of Belmont you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,963 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record under a tenth of a mile out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any Belmont-wide figureread your own land →