Morongo Valley, 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.
A short list that earns its place here — okra, meyer lemon, california poppy, and artichoke — with any one site's soil, sun, and drainage making the final cut.
Even in Morongo Valley, 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 Morongo Valley 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 Morongo Valley — soil, climate, flood, and parcel records. How we handle your address.
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Morongo Valley — the short answer
Morongo Valley, California: USDA zone 9b, about 294 days between hard freezes, across 16K acres of town.
- USDA zone
- 9b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Dec 11
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~294
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 16K 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 9b is Morongo Valley's average, not your lot's — a low corner or a tree line moves it. Against Morongo Valley's 294-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Morongo Valley
Each reading below is measured for Morongo Valley itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMorongo Valley runs about 294 days between hard freezes — 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
MeasuredMorongo Valley 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 Morongo Valley is in
Morongo Valley sits in the Mojave Basin and Range — EPA Level III, inside the wider North American Deserts. That is read at Morongo Valley's own centroid rather than borrowed from San Bernardino County.
What Grows in Morongo Valley
Every plant below cleared Morongo Valley's own zone 9b and its 294-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Morongo Valley?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Jan 23; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 20 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 11 — 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 Morongo Valley
Closest first, within ~10 miles of Morongo Valley. Listing isn't leaking, and distance isn't exposure.
- 001S004E15Q001SNitrate · 0.7 mi
- MORONGO VALLEY LANDFILLBrownfields · 1.2 mi
- DOLLAR GENERAL STORE #17905Brownfields · 1.6 mi
- JESUS SIERRABrownfields · 1.6 mi
- TRUST AUTOMOTIVEBrownfields · 1.6 mi
- MUELLER TURNER COMPANYBrownfields · 1.9 mi
- TECHNIQUE DESIGNS INC.Brownfields · 1.9 mi
- Pierce Ranch ProspectMining · 1.9 mi
- G&M Oil Co.#86Underground Storage Tanks · 2.0 mi
- G & M OIL COMPANY - (CHEVRON)Brownfields · 2.0 mi
- CIRCLE K STORE #770Brownfields · 2.2 mi
- CIRCLE K STORES INC 2700770Brownfields · 2.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Morongo Valley'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 Morongo Valley.
Total Sites
287
within ~10 miles of Morongo Valley
Risk Level
Elevated
Highest-severity
7 mining sites (prospects, none worked)
Sources Checked
within ~10 miles of Morongo Valley
Severity Distribution
within ~10 miles of Morongo Valley
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Morongo Valley, two things run higher than the national average within ~10 miles of Morongo Valley — Nitrate (106 sites) and Brownfields (158 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 Morongo Valley
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 Morongo Valley average
Your land is one point inside Morongo Valley
Everything above resolves to Morongo Valley as a whole — one PHZM band and one 28°F frost record, read across 16K 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 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 Morongo Valley Average
Morongo Valley Average
- ●USDA Zones 9b, averaged across Morongo Valley
- ●One soil character for all of Morongo Valley
- ●Frost dates read at Morongo Valley's scale: Feb 20 to Dec 11
YOUR Parcel
- ✓Your exact zone, not Morongo Valley's 9b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Morongo Valley
Pull a site-specific report for your exact address in Morongo Valley, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Morongo Valley averages can't show:
We read public map data around Morongo Valley — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Morongo Valley average
How we know this about Morongo Valley
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 Morongo Valley’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 Morongo Valley
When does frost risk typically end in Morongo Valley?
The last hard freeze (28°F) in Morongo Valley typically lands around Feb 20, 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 13.
When is the first frost in Morongo Valley?
The first hard freeze (28°F) in Morongo Valley typically arrives around Dec 11, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 27, so the watching starts about Nov 11 — about 294 days after the spring freeze cleared.
How long is the growing season in Morongo Valley?
Measured between 28°F hard freezes, Morongo Valley sees about 294 frost-free days — roughly Feb 20 through Dec 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 13 to Nov 27, about 259 days.
Is the soil safe to grow vegetables in Morongo Valley?
The federal record around Morongo Valley is a meaningful one — 287 documented sites, mostly Brownfields entries (158), the nearest Nitrate record about 0.7 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 Morongo Valley?
From about Nov 11 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 11 (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 11. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Morongo Valley's scale — its 9b band and its 294-day season. Your yard writes its own version of Morongo Valley'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 Morongo Valley’s own scale
6 of the readings below were taken at Morongo Valley's own scale — its own ~294-day season between 28°F freezes, the 16,140 acres it covers and 287 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Morongo Valley's own USDA hardiness band, zones 9bUSDA PHZM 2023
- Morongo Valley's own 28°F hard-freeze dates, about Feb 20 and Dec 11 and the ~294-day span between themNOAA 1991–2020 Climate Normals
- 287 documented contamination sites on the federal record near Morongo Valley, the closest Nitrate record about 0.7 miles out from the town centreFederal environmental registers
- Morongo Valley's boundary and the 16,140 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9b and a ~294-day seasonGrowable Ground crop-matching engine
- The ecoregion at Morongo Valley's own centroid, the Mojave Basin and RangeUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Morongo Valley's 16,140 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 Morongo Valley's 16,140 acreswhy one lot differs from the next →
- Which side of Morongo Valley you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 16,140 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.7 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 Morongo Valley-wide figureread your own land →