Santa Barbara County, in California, sits in USDA hardiness zone 10a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Reliable performers under these conditions include artichoke, meyer lemon, california poppy, and cabbage; what your own ground favors still comes down to its soil, sun, and drainage.
Santa Barbara County lies within the California Central Coast — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring
Santa Barbara County holds more than one microclimate.
Soils and elevations shift across Santa Barbara County, so your frost dates and drainage aren't the county average. 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 Santa Barbara County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Santa Barbara County — the short answer
Santa Barbara County, California: USDA zone 10a, no 28°F killing freeze on record — the season is year-round, across 1.7M acres.
- USDA zone
- 10a
- USDA PHZM 2023
- Killing freeze
- None on record
- NOAA RCC ACIS 1991–2020, county record
- County area
- 1.7M 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
Frost-free — but not in every corner
Santa Barbara County's own 30-year record carries no 28°F killing freeze. That is measured at the county's record, though, not promised for every acre in it — and 16 towns inside it have their own 30-year record showing a killing freeze, among them Cuyama (a 251-day season), New Cuyama (266) and Santa Ynez (304).
Those are measured records, not estimates. If you garden in one of those pockets, plant against your own town's season rather than the county's.
NOAA Regional Climate Centers ACIS (1991–2020), 30-year daily minimum record
Zone 10a is Santa Barbara County's average, not your lot's — a low corner or a tree line moves it. Against Santa Barbara County's no killing freeze on record, see what your own ground reads.
Heat and winter chill in Santa Barbara County
Across a year, Santa Barbara County accumulates about 4,592 growing degree days above 50°F, about 835 more than the middle California county — ahead of 43 of California’s 57 counties. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Winter banks about 52 hours below 45°F, 1,135 fewer than the California middle of 1,187. Chill is what tells a fruit tree its dormancy is over, and it is set by climate rather than by anything you can build.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Santa Barbara County
Across Santa Barbara County, the ground is predominantly Mollisols, where Chamise, Shedd, and Arnold are the most extensive named soil series. The soil is generally well drained with a sandy loam surface. Topsoil pH runs about 6.1–7.0, slightly acidic. Rainfall drains through hydrologic group D soils.
Soil order
Mollisols
Drainage
Well drained
Hydric soils
0%
Soil still varies lot by lot — soil types explained.
How the ground varies across Santa Barbara County
The USDA soil survey maps 74% of Santa Barbara County as well drained — but another 24% drains differently: 14% somewhat excessively drained, 5% excessively drained.
Chamise is the most extensive named soil at 2% of mapped acres, then Shedd (2%) and Arnold (2%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Santa Barbara County
Each reading below is measured for Santa Barbara County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Santa Barbara County are well drained, in hydrologic group D — ground that drains quickly.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Santa Barbara County runs about pH 6.1–7.0, close to neutral.
This is the range most vegetables prefer — one correction you probably do not have to make, which is genuinely good news for a new bed.
Keep it there with compost rather than lime or sulfur, and only amend if your own soil test says otherwise.
USDA NRCS SSURGO
Season length
MeasuredSanta Barbara County records no 28°F killing freeze at all across the 30-year station record — 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
MeasuredSanta Barbara County 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 Santa Barbara County is in
Santa Barbara County spans 3 EPA Level III ecoregions — Central California Foothills and Coastal Mountains (52%), Southern California Mountains (36%) and Southern California/Northern Baja Coast (12%). Which one your land falls in changes what grows wild there and how the ground behaves, and a county-wide answer cannot tell you which.
What Grows in Santa Barbara County
We scored all 1,086 plants against Santa Barbara County's own USDA zone 10a and its own 365-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's California profile.
Documented around Santa Barbara County
- monarch butterfly89 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Santa Barbara County
USGS estimates 48,023 lb of Glyphosate on Santa Barbara County farmland in 2019, its largest by weight, ahead of Malathion (45,686 lb) and Imidacloprid (20,977 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Santa Barbara County — and how to grow with it.
We checked the federal record across Santa Barbara County — 4,588 documented sites across 7 of the 9 source types we track.
The most significant on record: 9 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
Santa Barbara County 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.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Santa Barbara County
Closest first, across Santa Barbara County. Listing isn't leaking, and distance isn't exposure.
- 005N030W30C001SNitrate · 3.4 mi
- 005N030W30F001SNitrate · 3.6 mi
- 006N030W30B001SNitrate · 3.6 mi
- 005N031W25H001SNitrate · 3.9 mi
- LONE TREE CREEK VINEYARDS LLCBrownfields · 3.9 mi
- 005N031W25G001SNitrate · 4.0 mi
- 005N031W25G002SNitrate · 4.0 mi
- 005N031W23G001SNitrate · 4.0 mi
- 005N030W28R001SNitrate · 4.1 mi
- 005N030W33A001SNitrate · 4.1 mi
- 005N030W30N002SNitrate · 4.2 mi
- 005N030W30N001SNitrate · 4.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Santa Barbara County'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 Santa Barbara County.
Sources Checked
across Santa Barbara County
Severity Distribution
across Santa Barbara County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Santa Barbara County, two things run higher than the national average across Santa Barbara County — Nitrate (1,912 sites) and Brownfields (2,390 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Brownfields: Brownfield sites are former commercial or industrial properties where legacy soil contamination (heavy metals, PAHs, petroleum compounds) may persist.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check EPA brownfield remediation status — many sites have completed cleanup with institutional controls.
Check your specific parcel in Santa Barbara County
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 Santa Barbara County average
Your land is one point inside Santa Barbara County
Everything above resolves to Santa Barbara County as a whole — one PHZM band and one county frost record, read across 1.7M 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 county 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 county average.
Your Lot vs the Santa Barbara County Average
Santa Barbara County Average
- ●USDA Zones 10a, averaged across Santa Barbara County
- ●One soil character for all of Santa Barbara County
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not Santa Barbara County's 10a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Santa Barbara County
Pull a site-specific report for your exact address in Santa Barbara County, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Santa Barbara County averages can't show:
We read public map data around Santa Barbara County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Santa Barbara County average
How we know this about Santa Barbara County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Santa Barbara County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Santa Barbara County
Is it too late to plant in Santa Barbara County?
No — Santa Barbara County 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 Santa Barbara County?
It doesn't — Santa Barbara County 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 Santa Barbara County?
Year-round — the 1991–2020 station record for Santa Barbara County 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 Santa Barbara County?
The federal record around Santa Barbara County runs heavier than most — 4,588 documented sites, mostly Brownfields entries (2,390), the nearest Nitrate record about 3.4 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.
Everything above is measured at Santa Barbara County's scale — its 10a band and its no killing freeze on record. Your yard writes its own version of Santa Barbara County's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads California's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Santa Barbara County’s own scale
9 of the readings below were taken at Santa Barbara County's own scale — a 30-year record with no killing freeze in it, the 3 most extensive soil series mapped here and 4,588 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Santa Barbara County's own USDA hardiness band, zones 10aUSDA PHZM 2023
- No 28°F killing freeze in Santa Barbara County's own 30-year station record — a year-round growing season, measured here rather than inheritedNOAA Regional Climate Centers ACIS, 1991-2020
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Santa Barbara CountyUSDA NRCS SSURGO
- 4,588 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Nitrate record about 3.4 miles outFederal environmental registers
- Santa Barbara County's boundary and the 1,749,721 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 10a and a ~365-day seasonGrowable Ground crop-matching engine
- The 3 ecoregions Santa Barbara County spans, Central California Foothills and Coastal Mountains the largestUS EPA Level III Ecoregions
- Open occurrence records documented in Santa Barbara County for a tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Santa Barbara County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every California grower plans around — written at state scale, so they stay on the state guidefrom California
What this page can’t tell you
- How the season shifts across Santa Barbara County — the ~365 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Santa Barbara County's 1,749,721 acreswhy one lot differs from the next →
- Which of those 4,588 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Santa Barbara Countyread your own land →