Twentynine Palms, California, sits in USDA hardiness zone 9a — a zone band wide enough that plant choice, not possibility, is the interesting question.
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 Twentynine Palms, 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 Twentynine Palms 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 Twentynine Palms — soil, climate, flood, and parcel records. How we handle your address.
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Twentynine Palms — the short answer
Twentynine Palms, California: USDA zone 9a, about 328 days between hard freezes, across 38K acres of city.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jan 18
- San Bernardino County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 12
- San Bernardino County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~328
- San Bernardino County normal — NOAA 1991–2020, nearest to this town
- City area
- 38K 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 San Bernardino County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9a is Twentynine Palms's average, not your lot's — a low corner or a tree line moves it. Against Twentynine Palms's 328-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Twentynine Palms
Each reading below is measured for Twentynine Palms itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsTwentynine Palms runs about 328 days between hard freezes (read from San Bernardino County, the closest normal to Twentynine Palms) — 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
MeasuredTwentynine Palms 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 Twentynine Palms is in
Twentynine Palms sits in the Mojave Basin and Range — EPA Level III, inside the wider North American Deserts. That is read at Twentynine Palms's own centroid rather than borrowed from San Bernardino County.
What Grows in Twentynine Palms
Every plant below cleared Twentynine Palms's own zone 9a and its 328-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Twentynine Palms?
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 18 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 12 — long-season crops need about 90 days of runway, quick greens only 30. In a climate this gentle, “too late” hardly applies — the question becomes which crops prefer the cooler months ahead.
What's on the federal record near Twentynine Palms
Closest first, within ~10 miles of Twentynine Palms. Listing isn't leaking, and distance isn't exposure.
- MUSD/OASIS ELEMENTARY SCHOOLBrownfields · 1900 ft
- MUSD/TWENTYNINE PALMS HIGH SCHOOLBrownfields · 0.7 mi
- CIRCLE K STORE #348Brownfields · 0.7 mi
- CIRCLE K STORES INC 2700348Brownfields · 0.7 mi
- SAN BERNARDINO COUNTY FIRE DEPARTMENT HHW PROGRAMBrownfields · 0.7 mi
- FLEET MANAGEMENT 29 PALMS SERVICE CENTERBrownfields · 0.7 mi
- Circle K Store #2700348Underground Storage Tanks · 0.7 mi
- DESERT CYCLE WORKS INCBrownfields · 0.9 mi
- 29 PALMS ARCO AM/PMUnderground Storage Tanks · 0.9 mi
- TWENTYNINE PALMS ARCO AM/PMBrownfields · 0.9 mi
- YUCCA VALLEY CHRYSLER CENTERBrownfields · 0.9 mi
- FAMILY DOLLAR INC 10947Brownfields · 0.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Twentynine Palms'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 Twentynine Palms.
Total Sites
130
within ~10 miles of Twentynine Palms
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Twentynine Palms
Severity Distribution
within ~10 miles of Twentynine Palms
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Twentynine Palms, two things run higher than the national average within ~10 miles of Twentynine Palms — Nitrate (44 sites) and Brownfields (70 sites). 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.
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 Twentynine Palms
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 Twentynine Palms average
Your land is one point inside Twentynine Palms
Everything above resolves to Twentynine Palms as a whole — one PHZM band, read across 38K acres, with hard-freeze dates borrowed from San Bernardino 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 Twentynine Palms Average
Twentynine Palms Average
- ●USDA Zones 9a, averaged across Twentynine Palms
- ●One soil character for all of Twentynine Palms
- ●Frost dates read at Twentynine Palms's scale: Jan 18 to Dec 12
YOUR Parcel
- ✓Your exact zone, not Twentynine Palms's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Twentynine Palms
Pull a site-specific report for your exact address in Twentynine Palms, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Twentynine Palms averages can't show:
We read public map data around Twentynine Palms — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Twentynine Palms average
How we know this about Twentynine Palms
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 San Bernardino 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 Twentynine Palms
When does frost risk typically end in Twentynine Palms?
The last hard freeze (28°F) in Twentynine Palms typically lands around Jan 18, 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 8.
When is the first frost in Twentynine Palms?
The first hard freeze (28°F) in Twentynine Palms typically arrives around Dec 12, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 28, so the watching starts about Nov 12 — about 328 days after the spring freeze cleared.
How long is the growing season in Twentynine Palms?
Measured between 28°F hard freezes, Twentynine Palms sees about 328 frost-free days — roughly Jan 18 through Dec 12, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 8 to Nov 28, about 293 days.
Is the soil safe to grow vegetables in Twentynine Palms?
The federal record around Twentynine Palms is a meaningful one — 130 documented sites, mostly Brownfields entries (70), the nearest Brownfields record about 0.4 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 Twentynine Palms?
From about Nov 12 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 12 (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 12. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Twentynine Palms's scale — its 9a band and its 328-day season. Your yard writes its own version of Twentynine Palms'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 Twentynine Palms’s own scale
5 of the readings below were taken at Twentynine Palms's own scale — the 37,599 acres it covers and 130 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Twentynine Palms's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 130 documented contamination sites on the federal record near Twentynine Palms, the closest Brownfields record about 0.4 miles out from the town centreFederal environmental registers
- Twentynine Palms's boundary and the 37,599 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~328-day seasonGrowable Ground crop-matching engine
- The ecoregion at Twentynine Palms's own centroid, the Mojave Basin and RangeUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Twentynine Palms has no normal of its own, so its county's is the closest measured readfrom San Bernardino County
- Soil character — no town-scale survey exists, so Twentynine Palms's 37,599 acres read through its county's SSURGO summaryfrom San Bernardino County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom San Bernardino 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 San Bernardino County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Twentynine Palms's 37,599 acreswhy one lot differs from the next →
- Which side of Twentynine Palms you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 37,599 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.4 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 Twentynine Palms-wide figureread your own land →