Idlewild, California, sits in USDA hardiness zone 9a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Reliable performers under these conditions include artichoke, fig, california poppy, and cabbage; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Idlewild, 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 Idlewild 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 Idlewild — soil, climate, flood, and parcel records. How we handle your address.
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Idlewild — the short answer
Idlewild, California: USDA zone 9a, about 251 days between hard freezes, across 294 acres of town.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 21
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~251
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 294 acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 9a is Idlewild's average, not your lot's — a low corner or a tree line moves it. Against Idlewild's 251-day season, see what your own ground reads.
Your town runs its own season
Idlewild's own 30-year record measures about 251 days between 28°F killing freezes — 45 days shorter than Tulare County's ~296. Both are measured records, not estimates.
That gap is the whole reason a county average can mislead here. Plant against Idlewild's ~251-day season rather than the county figure — and the sun, slope and cold-air drainage on your specific lot move it again.
NOAA Regional Climate Centers ACIS (1991–2020), 30-year daily minimum record. Both figures are measured records — this town’s own and its county’s. A town with no record of its own is absent here rather than estimated.
Soil varies lot by lot — soil types explained.
What this means for growing in Idlewild
Each reading below is measured for Idlewild itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredIdlewild runs about 251 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredIdlewild 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 Idlewild is in
Idlewild sits in the Central California Foothills and Coastal Mountains — EPA Level III, inside the wider Mediterranean California. That is read at Idlewild'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 Idlewild
Every plant below cleared Idlewild's own zone 9a and its 251-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Idlewild?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Feb 21; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 21 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 27 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
What's on the federal record near Idlewild
Closest first, within ~10 miles of Idlewild. Listing isn't leaking, and distance isn't exposure.
- White River ProspectMining · 3.0 mi
- White River ClaimsMining · 3.0 mi
- 023S031E31N001MNitrate · 4.8 mi
- MJ BATESBrownfields · 4.9 mi
- GLENNVILLE TRANSFER STATIONBrownfields · 5.2 mi
- 023S030E35H001MNitrate · 5.4 mi
- 025S031E30H001MNitrate · 5.9 mi
- Lucky Hit DepositMining · 6.8 mi
- Major MineMining · 7.0 mi
- CALTRANS D6 MAINTENANCE GLENNVILLE MSBrownfields · 7.0 mi
- Big Oscar Antimony DepositMining · 7.4 mi
- Susie Q ProspectMining · 7.7 mi
2 more sites are on the record inside the same radius. See them on the map
Measured from Idlewild'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 Idlewild.
Severity Distribution
within ~10 miles of Idlewild
Highest-Severity Sites
Know Before You Grow
- •Mine waste leaches heavy metals. Test for lead, arsenic and cadmium before growing food here.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
- •Near a brownfield, raised beds of imported soil give your food clean ground.
Check your specific parcel in Idlewild
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 Idlewild average
Your land is one point inside Idlewild
Everything above resolves to Idlewild as a whole — and this is a town whose own 30-year record already runs a season its county’s does not. Your parcel sits at one point inside even that. 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 town 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 Idlewild Average
Idlewild Average
- ●USDA Zones 9a, averaged across Idlewild
- ●One soil character for all of Idlewild
- ●Frost dates read at Idlewild's scale: Mar 21 to Nov 27
YOUR Parcel
- ✓Your exact zone, not Idlewild's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Idlewild
Pull a site-specific report for your exact address in Idlewild, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Idlewild averages can't show:
We read public map data around Idlewild — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Idlewild average
How we know this about Idlewild
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Idlewild’s own record; 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 town grain anywhere on this page — there is no town-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 Idlewild
When does frost risk typically end in Idlewild?
The last hard freeze (28°F) in Idlewild typically lands around Mar 21, 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 Apr 11.
When is the first frost in Idlewild?
The first hard freeze (28°F) in Idlewild typically arrives around Nov 27, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 13, so the watching starts about Oct 28 — about 251 days after the spring freeze cleared.
How long is the growing season in Idlewild?
Measured between 28°F hard freezes, Idlewild sees about 251 frost-free days — roughly Mar 21 through Nov 27, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 11 to Nov 13, about 216 days.
Is the soil safe to grow vegetables in Idlewild?
The federal record around Idlewild is light — 18 documented sites across the 9 federal source types we checked, mostly Mining entries (8), the nearest Mining record about 3.0 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in Idlewild?
From about Oct 28 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 Nov 27 (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 Nov 27. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Idlewild's scale — its 9a band and its 251-day season. Your yard writes its own version of Idlewild'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 Idlewild’s own scale
6 of the readings below were taken at Idlewild's own scale — its own ~251-day season between 28°F freezes, the 294 acres it covers and 18 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Idlewild's own USDA hardiness band, zones 9aUSDA PHZM 2023
- Idlewild's own 28°F hard-freeze dates, about Mar 21 and Nov 27 and the ~251-day span between themNOAA 1991–2020 Climate Normals
- 18 documented contamination sites on the federal record near Idlewild, the closest Mining record about 3.0 miles out from the town centreFederal environmental registers
- Idlewild's boundary and the 294 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~251-day seasonGrowable Ground crop-matching engine
- Idlewild sits in the Central California Foothills and Coastal Mountains — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Idlewild's 294 acres read through its county's SSURGO summaryfrom Tulare County
- 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 Idlewild's 294 acreswhy one lot differs from the next →
- Which side of Idlewild you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 294 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Mining record about 3.0 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 Idlewild-wide figureread your own land →