Wildomar, California, sits in USDA hardiness zone 9b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
The conditions favor okra, meyer lemon, california poppy, and artichoke, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Wildomar, 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 Wildomar 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 Wildomar — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Wildomar — the short answer
Wildomar, California: USDA zone 9b, about 303 days between hard freezes, across 15K acres of city.
- USDA zone
- 9b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 13
- Riverside County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 13
- Riverside County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~303
- Riverside County normal — NOAA 1991–2020, nearest to this town
- City area
- 15K 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 Riverside County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9b is Wildomar's average, not your lot's — a low corner or a tree line moves it. Against Wildomar's 303-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Wildomar
Each reading below is measured for Wildomar itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsWildomar runs about 303 days between hard freezes (read from Riverside County, the closest normal to Wildomar) — 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
MeasuredWildomar 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 Wildomar is in
Wildomar sits in the Southern California/Northern Baja Coast — EPA Level III, inside the wider Mediterranean California. That is read at Wildomar's own centroid, and it is not what its county reads: Riverside County is mostly Sonoran Basin and Range. The wider page above you is answering a different question about different ground.
What Grows in Wildomar
Every plant below cleared Wildomar's own zone 9b and its 303-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Wildomar?
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 16; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 13 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 13 — 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 Wildomar
Closest first, within ~10 miles of Wildomar. Listing isn't leaking, and distance isn't exposure.
- FARM MUTUAL W.C. (THE)PFAS · 700 ft
- UPLAND DENTAL IMPLANT & ORTHODONTICS DENTAL GROUPBrownfields · 900 ft
- 006S004W36D001SNitrate · 2000 ft
- 006S004W26Q001SNitrate · 2400 ft
- OMNIMEDICALBrownfields · 0.5 mi
- Electric Copper and Gold MineMining · 0.5 mi
- GIANT INLAND EMPIRE RV CENTER DBA GIANT RVBrownfields · 0.6 mi
- ADAN ALBERTO RUIZ DBA CAXCAN TRANSPORTBrownfields · 0.7 mi
- HODGES'S CONCRETEBrownfields · 0.7 mi
- Electric Copper and GoldMining · 0.8 mi
- 006S004W35F001SNitrate · 0.9 mi
- TESORO(SHELL/CIRCLE K) 68936Underground Storage Tanks · 0.9 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Wildomar'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 Wildomar.
Total Sites
1,773
within ~10 miles of Wildomar
Risk Level
Elevated
Highest-severity
21 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Wildomar
Severity Distribution
within ~10 miles of Wildomar
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Wildomar, Brownfields runs higher than the national average — 1,265 sites within ~10 miles of Wildomar. 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 Wildomar
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 Wildomar average
Your land is one point inside Wildomar
Everything above resolves to Wildomar as a whole — one PHZM band, read across 15K acres, with hard-freeze dates borrowed from Riverside 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 Wildomar Average
Wildomar Average
- ●USDA Zones 9b, averaged across Wildomar
- ●One soil character for all of Wildomar
- ●Frost dates read at Wildomar's scale: Feb 13 to Dec 13
YOUR Parcel
- ✓Your exact zone, not Wildomar's 9b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Wildomar
Pull a site-specific report for your exact address in Wildomar, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Wildomar averages can't show:
We read public map data around Wildomar — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Wildomar average
How we know this about Wildomar
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 Riverside 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 Wildomar
When does frost risk typically end in Wildomar?
The last hard freeze (28°F) in Wildomar typically lands around Feb 13, 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 6.
When is the first frost in Wildomar?
The first hard freeze (28°F) in Wildomar typically arrives around Dec 13, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 29, so the watching starts about Nov 13 — about 303 days after the spring freeze cleared.
How long is the growing season in Wildomar?
Measured between 28°F hard freezes, Wildomar sees about 303 frost-free days — roughly Feb 13 through Dec 13, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 6 to Nov 29, about 268 days.
Is the soil safe to grow vegetables in Wildomar?
The federal record around Wildomar is a meaningful one — 1,773 documented sites, mostly Brownfields entries (1,265), the nearest PFAS record about 0.1 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 Wildomar?
From about Nov 13 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 13 (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 13. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Wildomar's scale — its 9b band and its 303-day season. Your yard writes its own version of Wildomar'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 Wildomar’s own scale
5 of the readings below were taken at Wildomar's own scale — the 15,196 acres it covers and 1,773 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Wildomar's own USDA hardiness band, zones 9bUSDA PHZM 2023
- 1,773 documented contamination sites on the federal record near Wildomar, the closest PFAS record about 0.1 miles out from the town centreFederal environmental registers
- Wildomar's boundary and the 15,196 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9b and a ~303-day seasonGrowable Ground crop-matching engine
- Wildomar sits in the Southern California/Northern Baja Coast — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Wildomar has no normal of its own, so its county's is the closest measured readfrom Riverside County
- Soil character — no town-scale survey exists, so Wildomar's 15,196 acres read through its county's SSURGO summaryfrom Riverside County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Riverside 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 Riverside County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Wildomar's 15,196 acreswhy one lot differs from the next →
- Which side of Wildomar you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 15,196 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest PFAS record about 0.1 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 Wildomar-wide figureread your own land →
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