Broadmoor, California, sits in USDA hardiness zone 10b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
The conditions favor artichoke, meyer lemon, california poppy, and cabbage, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Broadmoor, 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 Broadmoor 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 Broadmoor — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Broadmoor — the short answer
Broadmoor, California: USDA zone 10b, no 28°F killing freeze on record — the season is year-round, across 276 acres of town.
- USDA zone
- 10b
- USDA PHZM 2023
- Killing freeze
- None on record
- NOAA RCC ACIS 1991–2020, this town’s own record
- Town area
- 276 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 10b is Broadmoor's average, not your lot's — a low corner or a tree line moves it. Against Broadmoor'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 Broadmoor
Each reading below is measured for Broadmoor itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Winter hardiness
MeasuredBroadmoor sits in USDA hardiness zone 10b.
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 Broadmoor is in
Broadmoor sits in the Central California Foothills and Coastal Mountains — EPA Level III, inside the wider Mediterranean California. That is read at Broadmoor'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 Broadmoor
Every plant below cleared Broadmoor's own zone 10b. Each card opens that plant's California profile. How we score.
Documented around Broadmoor
Spotted lanternfly documented 14 miles from Broadmoor, first recorded 2023. What to watch for.
What's on the federal record near Broadmoor
Closest first, within ~10 miles of Broadmoor. Listing isn't leaking, and distance isn't exposure.
- SHOSHANA KALINSKIBrownfields · 1500 ft
- WESTLAKE VILLAGE APTBrownfields · 1600 ft
- JUNIPERO SERRA AUTO REPAIRBrownfields · 1700 ft
- WESTLAKE VILL 5 CORONADOBrownfields · 1800 ft
- 003S006W02R001MNitrate · 1900 ft
- WESTLAKE ARCO SERVICEBrownfields · 2100 ft
- BP 00465Brownfields · 2100 ft
- ARCO 00465Underground Storage Tanks · 2100 ft
- SAN MATEO MEDICAL CENTER DBA DALY CITY ADULT/YOUTH HEALTH CENTER CLINICBrownfields · 2200 ft
- BURLINGTON STORE # 182Brownfields · 2200 ft
- CITY OF DALY CITYBrownfields · 2200 ft
- COUNTY OF SAN MATEOBrownfields · 2200 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Broadmoor'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 Broadmoor.
Sources Checked
within ~10 miles of Broadmoor
Severity Distribution
within ~10 miles of Broadmoor
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Broadmoor, Brownfields runs higher than the national average — 6,355 sites within ~10 miles of Broadmoor. That's not a problem with your land — it's information about it.
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 Broadmoor
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 Broadmoor average
Your land is one point inside Broadmoor
Everything above resolves to Broadmoor as a whole — one PHZM band and one 28°F frost record, read across 276 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 town 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 Broadmoor Average
Broadmoor Average
- ●USDA Zones 10b, averaged across Broadmoor
- ●One soil character for all of Broadmoor
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not Broadmoor's 10b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Broadmoor
Pull a site-specific report for your exact address in Broadmoor, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Broadmoor averages can't show:
We read public map data around Broadmoor — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Broadmoor average
How we know this about Broadmoor
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’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 town grain anywhere on this page — there is no town-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 Broadmoor
Is it too late to plant in Broadmoor?
No — Broadmoor 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 Broadmoor?
It doesn't — Broadmoor 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 Broadmoor?
Year-round — the 1991–2020 station record for Broadmoor 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 Broadmoor?
The federal record around Broadmoor is a meaningful one — 6,876 documented sites, mostly Brownfields entries (6,355), the nearest Brownfields record about 0.3 miles 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 Broadmoor's scale — its 10b band and its no killing freeze on record. Your yard writes its own version of Broadmoor'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 Broadmoor’s own scale
7 of the readings below were taken at Broadmoor's own scale — the 276 acres it covers and 6,876 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Broadmoor's own USDA hardiness band, zones 10bUSDA PHZM 2023
- No 28°F killing freeze in the 30-year station record covering Broadmoor — a year-round growing seasonNOAA Regional Climate Centers ACIS, 1991-2020
- 6,876 documented contamination sites on the federal record near Broadmoor, the closest Brownfields record about 0.3 miles out from the town centreFederal environmental registers
- Broadmoor's boundary and the 276 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear Broadmoor's hardiness zoneGrowable Ground crop-matching engine
- Broadmoor 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 Broadmoorlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Broadmoor's 276 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 Broadmoor's 276 acreswhy one lot differs from the next →
- Which side of Broadmoor you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 276 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.3 miles 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 Broadmoor-wide figureread your own land →