Exeter, 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.
On paper, tomato, artichoke, fig, and california poppy all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Exeter, 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 Exeter 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 Exeter — soil, climate, flood, and parcel records. How we handle your address.
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Exeter — the short answer
Exeter, California: USDA zone 9b, about 296 days between hard freezes, across 2K acres of city.
- USDA zone
- 9b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 17
- Tulare County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 10
- Tulare County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~296
- Tulare County normal — NOAA 1991–2020, nearest to this town
- City area
- 2K 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 Tulare County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9b is Exeter's average, not your lot's — a low corner or a tree line moves it. Against Exeter's 296-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Exeter
Each reading below is measured for Exeter itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsExeter runs about 296 days between hard freezes (read from Tulare County, the closest normal to Exeter) — 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
MeasuredExeter 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 Exeter is in
Exeter sits in the Central California Valley — EPA Level III, inside the wider Mediterranean California. That is read at Exeter's own centroid, and it is not what its county reads: Tulare County is mostly Sierra Nevada. The wider page above you is answering a different question about different ground.
What Grows in Exeter
Plants matched to Exeter's USDA zones 9b, 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 Exeter?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Jan 20; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 17 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 10 — long-season crops need about 90 days of runway, quick greens only 30. Here the calendar nearly circles: cool-season crops take the winter shift, and the next window is always close.
What's on the federal record near Exeter
Closest first, within ~10 miles of Exeter. Listing isn't leaking, and distance isn't exposure.
- EXETER MINI MARTUnderground Storage Tanks · 250 ft
- EXETER AUTOMOTIVEBrownfields · 850 ft
- EXETER ENGINEERINGBrownfields · 1100 ft
- ORANGE BELT SUPPLY COMPANYBrownfields · 1300 ft
- EXETER PIK-N-GOUnderground Storage Tanks · 1300 ft
- EXETER SPECIALTIESBrownfields · 1300 ft
- LAZAR CAR WASHBrownfields · 1300 ft
- XTRA MARTUnderground Storage Tanks · 1400 ft
- GREGORY D MONROE CHIROPRATIC INCBrownfields · 1400 ft
- TF TIRE & SERVICEBrownfields · 1400 ft
- SAN JOAQUIN VALLEY RAILROAD COBrownfields · 1500 ft
- EXETER VETERINARY HOSPITALBrownfields · 1600 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Exeter'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 Exeter.
Sources Checked
within ~10 miles of Exeter
Severity Distribution
within ~10 miles of Exeter
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Exeter, Brownfields runs higher than the national average — 693 sites within ~10 miles of Exeter. 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 Exeter
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 Exeter average
Your land is one point inside Exeter
Everything above resolves to Exeter as a whole — one PHZM band, read across 2K acres, with hard-freeze dates borrowed from Tulare 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 Exeter Average
Exeter Average
- ●USDA Zones 9b, averaged across Exeter
- ●One soil character for all of Exeter
- ●Frost dates read at Exeter's scale: Feb 17 to Dec 10
YOUR Parcel
- ✓Your exact zone, not Exeter's 9b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Exeter
Pull a site-specific report for your exact address in Exeter, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Exeter averages can't show:
We read public map data around Exeter — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Exeter average
How we know this about Exeter
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 Tulare 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 Exeter
When does frost risk typically end in Exeter?
The last hard freeze (28°F) in Exeter typically lands around Feb 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 Mar 10.
When is the first frost in Exeter?
The first hard freeze (28°F) in Exeter typically arrives around Dec 10, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 26, so the watching starts about Nov 10 — about 296 days after the spring freeze cleared.
How long is the growing season in Exeter?
Measured between 28°F hard freezes, Exeter sees about 296 frost-free days — roughly Feb 17 through Dec 10, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 10 to Nov 26, about 261 days.
Is the soil safe to grow vegetables in Exeter?
The federal record around Exeter is a meaningful one — 913 documented sites, mostly Brownfields entries (693), the nearest Underground Storage Tanks record under a tenth of a mile 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 Exeter?
From about Nov 10 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 10 (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 10. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Exeter's scale — its 9b band and its 296-day season. Your yard writes its own version of Exeter'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 Exeter’s own scale
4 of the readings below were taken at Exeter's own scale — the 1,586 acres it covers and 913 documented sites around it; 6 are borrowed from a wider read, named and linked below.
Measured here
- Exeter's own USDA hardiness band, zones 9bUSDA PHZM 2023
- 913 documented contamination sites on the federal record near Exeter, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Exeter's boundary and the 1,586 acres inside itUS Census TIGER/Line 2025
- Exeter sits in the Central California Valley — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Exeter has no normal of its own, so its county's is the closest measured readfrom Tulare County
- Soil character — no town-scale survey exists, so Exeter's 1,586 acres read through its county's SSURGO summaryfrom Tulare 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 Tulare 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 Tulare County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Exeter's 1,586 acreswhy one lot differs from the next →
- Which side of Exeter you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,586 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile 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 Exeter-wide figureread your own land →
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