Wasco, California, sits in USDA hardiness zone 9a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
The conditions favor tomato, artichoke, fig, and california poppy, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Wasco, 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 Wasco 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 Wasco — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Wasco — the short answer
Wasco, California: USDA zone 9a, about 319 days between hard freezes, across 6K acres of city.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jan 23
- Kern County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 8
- Kern County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~319
- Kern County normal — NOAA 1991–2020, nearest to this town
- City area
- 6K 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 Kern County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9a is Wasco's average, not your lot's — a low corner or a tree line moves it. Against Wasco's 319-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Wasco
Each reading below is measured for Wasco itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsWasco runs about 319 days between hard freezes (read from Kern County, the closest normal to Wasco) — 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
MeasuredWasco sits in USDA hardiness zone 9a.
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 Wasco is in
Wasco sits in the Central California Valley — EPA Level III, inside the wider Mediterranean California. That is read at Wasco's own centroid rather than borrowed from Kern County.
What Grows in Wasco
Plants matched to Wasco's USDA zones 9a, ordered by how much hardiness margin each has here — the ones with room to spare at both ends of this town's band lead. Each links to its full growing profile.
Is it too late to plant in Wasco?
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 23 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 8 — long-season crops need about 90 days of runway, quick greens only 30. And with a calendar this mild, the honest answer is that planting barely stops — winter opens seasons colder regions never see.
What's on the federal record near Wasco
Closest first, within ~10 miles of Wasco. Listing isn't leaking, and distance isn't exposure.
- WASCO MEDICAL PLAZABrownfields · 1700 ft
- CURUTCHAGUE FARMSBrownfields · 0.5 mi
- WALMART STORE 5859Brownfields · 0.6 mi
- SIMPLOT SOILBUILDERSBrownfields · 0.7 mi
- KMART #3968Brownfields · 0.7 mi
- DOLLAR TREE #03296Brownfields · 0.8 mi
- 027S024E15C001MNitrate · 0.8 mi
- DOLLAR TREE #06810Brownfields · 1.0 mi
- WASCO MEDICAL AND DENTAL CENTERBrownfields · 1.0 mi
- WASCO UNION HIGH SCHOOL DISTRICTBrownfields · 1.0 mi
- AUTOZONE #5346Brownfields · 1.0 mi
- MINTA TINERBrownfields · 1.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Wasco'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 Wasco.
Total Sites
744
within ~10 miles of Wasco
Risk Level
Elevated
Highest-severity
4 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Wasco
Severity Distribution
within ~10 miles of Wasco
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Wasco, Nitrate runs higher than the national average — 424 sites within ~10 miles of Wasco. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Wasco
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 Wasco average
Your land is one point inside Wasco
Everything above resolves to Wasco as a whole — one PHZM band, read across 6K acres, with hard-freeze dates borrowed from Kern 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 Wasco Average
Wasco Average
- ●USDA Zones 9a, averaged across Wasco
- ●One soil character for all of Wasco
- ●Frost dates read at Wasco's scale: Jan 23 to Dec 8
YOUR Parcel
- ✓Your exact zone, not Wasco's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Wasco
Pull a site-specific report for your exact address in Wasco, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Wasco averages can't show:
We read public map data around Wasco — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Wasco average
How we know this about Wasco
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 Kern 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 Wasco
When does frost risk typically end in Wasco?
The last hard freeze (28°F) in Wasco typically lands around Jan 23, 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 13.
When is the first frost in Wasco?
The first hard freeze (28°F) in Wasco typically arrives around Dec 8, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 24, so the watching starts about Nov 8 — about 319 days after the spring freeze cleared.
How long is the growing season in Wasco?
Measured between 28°F hard freezes, Wasco sees about 319 frost-free days — roughly Jan 23 through Dec 8, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 13 to Nov 24, about 284 days.
Is the soil safe to grow vegetables in Wasco?
The federal record around Wasco is a meaningful one — 744 documented sites, mostly Nitrate entries (424), 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 Wasco?
From about Nov 8 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 8 (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 8. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Wasco's scale — its 9a band and its 319-day season. Your yard writes its own version of Wasco'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 Wasco’s own scale
4 of the readings below were taken at Wasco's own scale — the 6,008 acres it covers and 744 documented sites around it; 6 are borrowed from a wider read, named and linked below.
Measured here
- Wasco's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 744 documented contamination sites on the federal record near Wasco, the closest Brownfields record about 0.3 miles out from the town centreFederal environmental registers
- Wasco's boundary and the 6,008 acres inside itUS Census TIGER/Line 2025
- The ecoregion at Wasco's own centroid, the Central California ValleyUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Wasco has no normal of its own, so its county's is the closest measured readfrom Kern County
- Soil character — no town-scale survey exists, so Wasco's 6,008 acres read through its county's SSURGO summaryfrom Kern County
- The candidate plant list — California's curated set, filtered to this zone band and re-ordered by how much margin each has herefrom California
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Kern 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 Kern County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Wasco's 6,008 acreswhy one lot differs from the next →
- Which side of Wasco you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 6,008 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 Wasco-wide figureread your own land →