Campbell, California, sits in USDA hardiness zone 9b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
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 Campbell, 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 Campbell 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 Campbell — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Campbell — the short answer
Campbell, California: USDA zone 9b, about 331 days between hard freezes, across 4K acres of city.
- USDA zone
- 9b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jan 17
- Santa Clara County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 14
- Santa Clara County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~331
- Santa Clara County normal — NOAA 1991–2020, nearest to this town
- City area
- 4K 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 Santa Clara County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9b is Campbell's average, not your lot's — a low corner or a tree line moves it. Against Campbell's 331-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Campbell
Each reading below is measured for Campbell itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsCampbell runs about 331 days between hard freezes (read from Santa Clara County, the closest normal to Campbell) — 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
MeasuredCampbell sits in USDA hardiness zone 9b.
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 Campbell is in
Campbell sits in the Central California Foothills and Coastal Mountains — EPA Level III, inside the wider Mediterranean California. That is read at Campbell's own centroid rather than borrowed from Santa Clara County.
What Grows in Campbell
Every plant below cleared Campbell's own zone 9b and its 331-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Campbell?
Usually not — gardeners here simply switch what goes in the ground as the season moves. 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 17 (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. In a climate this gentle, “too late” hardly applies — the question becomes which crops prefer the cooler months ahead.
What's on the federal record near Campbell
Closest first, within ~10 miles of Campbell. Listing isn't leaking, and distance isn't exposure.
- CAMPBELL PLAZA CLEANERSBrownfields · 900 ft
- SAFEWAY STORE NO 1293Brownfields · 1000 ft
- DOLLAR TREE #03238Brownfields · 1100 ft
- NORMAN PAUL PRINT CENTERBrownfields · 1200 ft
- VTEC MOTOR SPORTS, INCBrownfields · 1400 ft
- ALL AUTO & TRUCK SPECIALISTS INCBrownfields · 1500 ft
- JSK AUTO CRAFT INC DBA C&N AUTO CENTERBrownfields · 1500 ft
- C & N AUTO CENTERBrownfields · 1500 ft
- WINCHESTER TRANSMISSION AND SERVICESBrownfields · 1500 ft
- MAZDA HONDA SPECIALISTS INCBrownfields · 1500 ft
- CAMPBELL FORD PERFORMANCEBrownfields · 1500 ft
- CAMPBELL EUROPEANBrownfields · 1500 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Campbell'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 Campbell.
Sources Checked
within ~10 miles of Campbell
Severity Distribution
within ~10 miles of Campbell
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Campbell, Brownfields runs higher than the national average — 8,283 sites within ~10 miles of Campbell. 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 Campbell
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 Campbell average
Your land is one point inside Campbell
Everything above resolves to Campbell as a whole — one PHZM band, read across 4K acres, with hard-freeze dates borrowed from Santa Clara County’s record because no 30-year normal resolves at this city’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 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 Campbell Average
Campbell Average
- ●USDA Zones 9b, averaged across Campbell
- ●One soil character for all of Campbell
- ●Frost dates read at Campbell's scale: Jan 17 to Dec 14
YOUR Parcel
- ✓Your exact zone, not Campbell's 9b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Campbell
Pull a site-specific report for your exact address in Campbell, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Campbell averages can't show:
We read public map data around Campbell — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Campbell average
How we know this about Campbell
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 at Santa Clara 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 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 Campbell
When does frost risk typically end in Campbell?
The last hard freeze (28°F) in Campbell typically lands around Jan 17, 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 7.
When is the first frost in Campbell?
The first hard freeze (28°F) in Campbell 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 331 days after the spring freeze cleared.
How long is the growing season in Campbell?
Measured between 28°F hard freezes, Campbell sees about 331 frost-free days — roughly Jan 17 through Dec 14, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 7 to Nov 30, about 296 days.
Is the soil safe to grow vegetables in Campbell?
The federal record around Campbell runs heavier than most — 9,297 documented sites, mostly Brownfields entries (8,283), 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 Campbell?
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 Campbell's scale — its 9b band and its 331-day season. Your yard writes its own version of Campbell'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 Campbell’s own scale
5 of the readings below were taken at Campbell's own scale — the 3,892 acres it covers and 9,297 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Campbell's own USDA hardiness band, zones 9bUSDA PHZM 2023
- 9,297 documented contamination sites on the federal record near Campbell, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- Campbell's boundary and the 3,892 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9b and a ~331-day seasonGrowable Ground crop-matching engine
- The ecoregion at Campbell's own centroid, the Central California Foothills and Coastal MountainsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Campbell has no normal of its own, so its county's is the closest measured readfrom Santa Clara County
- Soil character — no town-scale survey exists, so Campbell's 3,892 acres read through its county's SSURGO summaryfrom Santa Clara County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Santa Clara 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 Santa Clara County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Campbell's 3,892 acreswhy one lot differs from the next →
- Which side of Campbell you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,892 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 Campbell-wide figureread your own land →