Concord, California, sits in USDA hardiness zone 9b — a zone band wide enough that plant choice, not possibility, is the interesting question.
A short list that earns its place here — okra, meyer lemon, california poppy, and artichoke — with any one site's soil, sun, and drainage making the final cut.
Even in Concord, 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 Concord 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 Concord — soil, climate, flood, and parcel records. How we handle your address.
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Concord — the short answer
Concord, California: USDA zone 9b, about 332 days between hard freezes, across 20K acres of city.
- USDA zone
- 9b
- 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
- City area
- 20K 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 9b is Concord's average, not your lot's — a low corner or a tree line moves it. Against Concord's 332-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Concord
Each reading below is measured for Concord itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsConcord runs about 332 days between hard freezes (read from Contra Costa County, the closest normal to Concord) — 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
MeasuredConcord 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 Concord is in
Concord sits in the Central California Foothills and Coastal Mountains — EPA Level III, inside the wider Mediterranean California. That is read at Concord's own centroid rather than borrowed from Contra Costa County.
What Grows in Concord
Every plant below cleared Concord's own zone 9b and its 332-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Concord?
For most of the year, no — what changes is which crops still fit the days remaining. 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 Concord
Spotted lanternfly documented 20 miles from Concord, first recorded 2023. What to watch for.
What's on the federal record near Concord
Closest first, within ~10 miles of Concord. Listing isn't leaking, and distance isn't exposure.
- ALL-VAC IND CLEANING SERVBrownfields · 1400 ft
- CONTRA COSTA COUNTY HEALTH SERVICESBrownfields · 1600 ft
- JULIE MCHURONBrownfields · 1900 ft
- CHRISTINE PARDIBrownfields · 2200 ft
- DAMIAN & ANGELICA VALLISBrownfields · 2500 ft
- FORTUNE LANDSCAPE CO INCBrownfields · 2500 ft
- BIG O TIRES #16Brownfields · 0.5 mi
- ALISSA & NICK STOLZBrownfields · 0.5 mi
- WORLD OIL MARKETING CO #30Underground Storage Tanks · 0.5 mi
- WORLD OILBrownfields · 0.5 mi
- 7-ELEVEN #32604Brownfields · 0.6 mi
- LISA MADIGANBrownfields · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Concord'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 Concord.
Sources Checked
within ~10 miles of Concord
Severity Distribution
within ~10 miles of Concord
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Concord, Brownfields runs higher than the national average — 2,826 sites within ~10 miles of Concord. 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 Concord
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 Concord average
Your land is one point inside Concord
Everything above resolves to Concord as a whole — one PHZM band, read across 20K acres, with hard-freeze dates borrowed from Contra Costa 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 Concord Average
Concord Average
- ●USDA Zones 9b, averaged across Concord
- ●One soil character for all of Concord
- ●Frost dates read at Concord's scale: Jan 16 to Dec 14
YOUR Parcel
- ✓Your exact zone, not Concord's 9b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Concord
Pull a site-specific report for your exact address in Concord, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Concord averages can't show:
We read public map data around Concord — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Concord average
How we know this about Concord
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 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 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 Concord
When does frost risk typically end in Concord?
The last hard freeze (28°F) in Concord 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 Concord?
The first hard freeze (28°F) in Concord 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 Concord?
Measured between 28°F hard freezes, Concord 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 Concord?
The federal record around Concord is a meaningful one — 3,118 documented sites, mostly Brownfields entries (2,826), 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.
How do I protect my plants from frost in Concord?
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 Concord's scale — its 9b band and its 332-day season. Your yard writes its own version of Concord'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 Concord’s own scale
6 of the readings below were taken at Concord's own scale — the 19,564 acres it covers and 3,118 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Concord's own USDA hardiness band, zones 9bUSDA PHZM 2023
- 3,118 documented contamination sites on the federal record near Concord, the closest Brownfields record about 0.3 miles out from the town centreFederal environmental registers
- Concord's boundary and the 19,564 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9b and a ~332-day seasonGrowable Ground crop-matching engine
- The ecoregion at Concord's own centroid, the Central California Foothills and Coastal MountainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Concordlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- The 28°F hard-freeze dates — Concord 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 Concord's 19,564 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 Concord's 19,564 acreswhy one lot differs from the next →
- Which side of Concord you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 19,564 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 Concord-wide figureread your own land →