California spans USDA hardiness zones 5a-11a, with a growing season of about 220 frost-free days — a generous window with room for succession plantings and warm-season crops that need time to finish.
Those zone numbers rest on 5-80 inches of annual rainfall, a median of roughly 3,850 growing-degree days (base 50°F), and about 1,050 winter chill hours for tree fruit — the measurements that do the deciding. On the soil map, alluvial clay, sandy loam, adobe clay, and volcanic ash dominate — and drainage is the trait that separates an easy bed from a project. Zoom in and California resolves into Pacific Northwest, California Central Valley, and Sacramento Valley — distinct growing regions with distinct frost calendars. The conditions favor avocado, meyer lemon, tomato, and grape, among others — though every individual site edits that list with its own soil, sun, and drainage.
Grounded inUSDA PHZM 2023•NOAA Climate Normals•USDA NRCS SSURGO•GDD aggregate (Cornell CALS)•Chill-hour aggregate (MSU Extension)•USDA hardiness sub-region map•EPA FRS•USDA PLANTS•Growable Ground suitability scoring
California spans zones 5a-11a, but your yard sits in exactly one — and slope, tree cover, and low spots nudge it further. Enter your address and we'll score 1,112 plants against your land's actual soil, sun, and frost.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Distinct growing regions within California — each has its own zones, soils, and signature crops.
USDA Zones
5a-11a
USDA PHZM 2023
Last Frost
Jan 15 - May 15
NOAA 30-yr Normals
First Frost
Oct 1 - Dec 31
NOAA 30-yr Normals
Annual Rainfall
5-80 inches
NOAA Climate Normals
Zone maps are averages across California. Your yard's slope, trees, and frost pockets shift what actually grows — see your land's exact reading.
The soil types that dominate California — how each drains decides more about crop success than almost anything else. Tap any soil to learn what it is and how to work with it.
See the alluvial river-profile — alluvial clay is its finest, slowest-draining fraction.
Drainage
Slow, and often sitting over a shallow water table in low-lying valley positions — the flip side of all that fertility.
What thrives
Vigorous, moisture-loving crops: corn, squash, brassicas, celery, and cane fruit all pull hard from alluvial clay. Willows and many natives thrive where it stays damp.
Drainage
Fast. The sand fraction opens the soil up, so water moves through the root zone quickly and the surface rarely stays soggy. The trade is that nutrients ride out with the water.
What thrives
Root crops love it — carrots, potatoes, radishes, and onions size up cleanly in ground they can push through. Melons, sweet potatoes, asparagus, and most herbs appreciate the warmth and the drainage.
No verified open-license photo yet — see the clay and caliche images for the arid-West clay register.
Drainage
Slow. Adobe sheds summer irrigation across its surface until it wets thoroughly, then holds that moisture for weeks.
What thrives
Established fruit trees, grapes, and olives do well with deep, infrequent watering, and native and Mediterranean plants are built for exactly this ground. Summer vegetables prosper where the top foot has been opened with organic matter.
Drainage
Excellent and unusual: ash soils drain freely yet hold remarkable amounts of plant-available water in their porous structure — the best of both habits.
What thrives
Volcanic regions grow celebrated crops the world over: orchards, berries, vegetables, coffee, and wine grapes all prosper on ash-derived soils.
No verified open-license photo yet — the coastal-sand and loam images bracket what this soil looks like.
Drainage
Good. The sand fraction keeps water moving, while the finer material holds enough moisture to carry plants between fogs and rains.
What thrives
Cool-season crops thrive in the mild maritime air above this soil — greens, brassicas, peas, and artichokes are classic coastal performers, along with berries and many herbs.
Soil data: USDA NRCS SSURGO · Soil types explained
Plants well-suited to California's climate, soils, and growing season — each links to its full growing profile.
The plants California put its name on — cultural emblems, not growing recommendations.
Eschscholzia californica
Designated 1903. In our plant library — see its full growing profile.
Coast redwood
Sequoia sempervirens
Designated 1937.
Plants the USDA PLANTS Database documents as native and present in California — a real per-state range, not just a zone match. Presence is statewide, so a plant may still be uncommon in your specific county; your state’s Cooperative Extension or a native-plant society is the local authority.
US-native plants whose hardiness range overlaps California’s USDA zones 5a-11a but which USDA PLANTS doesn’t map to a single state range here. Zone overlap is a starting filter, not a range map.
What an experienced grower plans around here — each one has a move.
Drought is a persistent challenge — irrigation is essential in most regions
Design the water system before the plants: drip lines plus a thick mulch layer run a full garden on surprisingly little water.
Wildfire risk affects rural and foothill properties
Keep plantings low, lean, and well-watered near structures — your extension office publishes firewise landscaping guides for your county.
Adobe clay soils in valleys drain poorly without amendment
Work in compost over seasons, or skip the fight with a raised bed — adobe's nutrients are excellent once drainage is solved.
Wide climate variation means plant selection is highly location-specific
Zones run 5a to 11a in one state — check your exact zone before trusting any statewide planting list.
For cultivar selection, pest pressure, and planting-time guidance specific to California, the UC Agriculture and Natural Resources is the authoritative local source.
Safe to Grow Here?What the federal record shows across California — and how to grow with it.
We checked the federal record across California — 254,277 documented sites across 8 of the 9 source types we track.
The most significant on record: 1073 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
California carries one of the heavier federal records we track — and that's not a verdict on your yard. Proximity to a documented site is information, not a diagnosis: nothing here says any particular parcel is affected. It does earn one concrete step — before food beds go in the ground, a professional soil test tells you exactly what you're working with, and raised beds with clean imported soil grow well almost anywhere in the meantime.
Severity Distribution
across California
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around California, Brownfields runs higher than the national average — 196,551 sites nearby. 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.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
State averages sketch the shape. Your soil, sun exposure, drainage, and microclimate decide what actually takes. Pull a site-specific report for your exact parcel.
Enter your address. We read your soil, sun, drainage, and frost dates, then score 1,112 plants against the real conditions on your land.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources analyzed in seconds
California spans USDA hardiness zones 5a-11a, per the USDA Plant Hardiness Zone Map 2023. Zones reflect average annual extreme minimum temperatures from 1991–2020 weather data.
The last spring frost in California is typically around Jan 15 - May 15, and the first fall frost around Oct 1 - Dec 31, per NOAA 30-year climate normals (1991–2020). Your specific site may differ — frost dates vary by elevation, proximity to water, and local microclimate.
California's zones 5a-11a support a wide range — strong performers include Avocado, Meyer Lemon, Tomato, Grape, and Fig. What actually takes on any one site comes down to its soil, sun, and drainage, and we score each plant against the real conditions at your address.
Officially, California spans USDA zones 5a-11a (USDA PHZM 2023) — but a zone is a 30-year average of winter's coldest night across an area, and it can't see any one yard. A south-facing slope, a tree line, or a low frost pocket can shift a single site by half a zone either way, which is why neighboring gardeners often quote different numbers. We read the conditions at your exact address — soil, sun, slope, and frost — and score 1,112 plants against what's actually there.
The federal record across California runs heavier than most — 254,277 documented sites — 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.
Start with three facts. California spans USDA zones 5a-11a, which sets what survives winter; the statewide frost window runs about Jan 15 - May 15 to Oct 1 - Dec 31 (NOAA 30-year climate normals); and 254,277 documented sites sit on the federal record here, so a soil test before food beds is the smart first step. From there, matching plants to your actual soil and sun is the fun part.
Everything on this page is a California average. Your yard writes its own version — we read soil, sun, drainage, and frost at your exact address. Try it for 14 days — no card required.
Explore growing conditions by county — each has its own zone range and land area.
Explore growing conditions by city or town in California.
California shares its dominant growing region with these states — a useful comparison if you're weighing where a crop will behave the same way.
