Kensington, California, sits in USDA hardiness zone 10a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Crops well matched to these conditions include okra, meyer lemon, california poppy, and artichoke — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Kensington, 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 Kensington 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 Kensington — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Kensington — the short answer
Kensington, California: USDA zone 10a, about 332 days between hard freezes, across 617 acres of town.
- USDA zone
- 10a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jan 16
- Contra Costa County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 14
- Contra Costa County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~332
- Contra Costa County normal — NOAA 1991–2020, nearest to this town
- Town area
- 617 acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. No 30-year normal resolves at this town’s own centroid, so the hard-freeze dates are Contra Costa County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 10a is Kensington's average, not your lot's — a low corner or a tree line moves it. Against Kensington's 332-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Kensington
Each reading below is measured for Kensington itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsKensington runs about 332 days between hard freezes (read from Contra Costa County, the closest normal to Kensington) — close to year-round growing.
Frost is rarely the limit here; winter plantings are as real as summer ones, and the harder question is which crops shrug off the summer heat.
Grow cool-season crops through the mild winter, and choose heat-tolerant varieties for the summer beds.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredKensington 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 Kensington is in
Kensington sits in the Central California Foothills and Coastal Mountains — EPA Level III, inside the wider Mediterranean California. That is read at Kensington's own centroid rather than borrowed from Contra Costa County.
What Grows in Kensington
Every plant below cleared Kensington's own zone 10a and its 332-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Kensington?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Jan 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Jan 16 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 14 — long-season crops need about 90 days of runway, quick greens only 30. With almost year-round growing weather, timing is about heat and rainfall more than frost — some bench is always in play.
Documented around Kensington
Spotted lanternfly documented 11 miles from Kensington, first recorded 2023. What to watch for.
What's on the federal record near Kensington
Closest first, within ~10 miles of Kensington. Listing isn't leaking, and distance isn't exposure.
- STEVEN DONALDSONBrownfields · 950 ft
- SARAH ANZIABrownfields · 1200 ft
- JASON CARRICKBrownfields · 1300 ft
- KENSINGTON FIRE PROTECTION DISTRICTBrownfields · 1500 ft
- JEANINE CASTELLO-LINBrownfields · 1600 ft
- EBMUD SAN PABLO WATER TREATMENT PLANTBrownfields · 1600 ft
- EBMUD SAN PABLO WATER TREATMENT PLANTUnderground Storage Tanks · 1600 ft
- LORRAINE HANDBrownfields · 1600 ft
- LILLIAN FUJIMOTOBrownfields · 1600 ft
- DENNIS LEEBrownfields · 1700 ft
- ZARRIN FERDOWSI DDSBrownfields · 1700 ft
- STACEY JANOFFBrownfields · 1800 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Kensington'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 Kensington.
Sources Checked
within ~10 miles of Kensington
Severity Distribution
within ~10 miles of Kensington
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Kensington, Brownfields runs higher than the national average — 5,071 sites within ~10 miles of Kensington. 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 Kensington
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 Kensington average
Your land is one point inside Kensington
Everything above resolves to Kensington as a whole — one PHZM band, read across 617 acres, with hard-freeze dates borrowed from Contra Costa County’s record because no 30-year normal resolves at this town’s own centroid. 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 Kensington Average
Kensington Average
- ●USDA Zones 10a, averaged across Kensington
- ●One soil character for all of Kensington
- ●Frost dates read at Kensington's scale: Jan 16 to Dec 14
YOUR Parcel
- ✓Your exact zone, not Kensington's 10a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Kensington
Pull a site-specific report for your exact address in Kensington, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Kensington averages can't show:
We read public map data around Kensington — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Kensington average
How we know this about Kensington
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 at Contra Costa County’s record, because none resolves here; 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 Kensington
When does frost risk typically end in Kensington?
The last hard freeze (28°F) in Kensington typically lands around Jan 16, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about Feb 6.
When is the first frost in Kensington?
The first hard freeze (28°F) in Kensington typically arrives around Dec 14, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 30, so the watching starts about Nov 14 — about 332 days after the spring freeze cleared.
How long is the growing season in Kensington?
Measured between 28°F hard freezes, Kensington sees about 332 frost-free days — roughly Jan 16 through Dec 14, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 6 to Nov 30, about 297 days.
Is the soil safe to grow vegetables in Kensington?
The federal record around Kensington runs heavier than most — 5,543 documented sites, mostly Brownfields entries (5,071), the nearest Brownfields record about 0.2 miles out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in Kensington?
From about Nov 14 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Dec 14 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Dec 14. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Kensington's scale — its 10a band and its 332-day season. Your yard writes its own version of Kensington'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 Kensington’s own scale
6 of the readings below were taken at Kensington's own scale — the 617 acres it covers and 5,543 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Kensington's own USDA hardiness band, zones 10aUSDA PHZM 2023
- 5,543 documented contamination sites on the federal record near Kensington, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- Kensington's boundary and the 617 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 10a and a ~332-day seasonGrowable Ground crop-matching engine
- The ecoregion at Kensington's own centroid, the Central California Foothills and Coastal MountainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Kensingtonlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- The 28°F hard-freeze dates — Kensington has no normal of its own, so its county's is the closest measured readfrom Contra Costa County
- Soil character — no town-scale survey exists, so Kensington's 617 acres read through its county's SSURGO summaryfrom Contra Costa County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Contra Costa 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 Contra Costa County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Kensington's 617 acreswhy one lot differs from the next →
- Which side of Kensington you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 617 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.2 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 Kensington-wide figureread your own land →