Lake Mathews, California, sits in USDA hardiness zone 10a — a zone band wide enough that plant choice, not possibility, is the interesting question.
A short list that earns its place here — avocado, meyer lemon, tomato, and artichoke — with any one site's soil, sun, and drainage making the final cut.
Even in Lake Mathews, 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 Lake Mathews 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 Lake Mathews — soil, climate, flood, and parcel records. How we handle your address.
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Lake Mathews — the short answer
Lake Mathews, California: USDA zone 10a, about 303 days between hard freezes, across 10K acres of town.
- USDA zone
- 10a
- 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
- Town area
- 10K 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 10a is Lake Mathews's average, not your lot's — a low corner or a tree line moves it. Against Lake Mathews's 303-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Lake Mathews
Each reading below is measured for Lake Mathews itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsLake Mathews runs about 303 days between hard freezes (read from Riverside County, the closest normal to Lake Mathews) — 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
MeasuredLake Mathews sits in USDA hardiness zone 10a.
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 Lake Mathews is in
Lake Mathews sits in the Southern California/Northern Baja Coast — EPA Level III, inside the wider Mediterranean California. That is read at Lake Mathews'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 Lake Mathews
Plants matched to Lake Mathews's USDA zones 10a, 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 Lake Mathews?
For most of the year, no — what changes is which crops still fit the days remaining. 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. 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 Lake Mathews
Closest first, within ~10 miles of Lake Mathews. Listing isn't leaking, and distance isn't exposure.
- VP MECHANCIS INCBrownfields · 0.5 mi
- WESTERN MUNICIPAL WATER DISTRICTBrownfields · 0.7 mi
- CAUFIELD EQUIPMENTBrownfields · 1.2 mi
- JEAN PIERRE AND PATRICIA JOYCE GAGNIERBrownfields · 1.6 mi
- ROOSEVELT TANK SITEBrownfields · 1.9 mi
- SUNNY NURSERYBrownfields · 2.0 mi
- CUTTING EDGE EXCAVATION INCBrownfields · 2.1 mi
- ROBERTSONS READY MIXBrownfields · 2.2 mi
- SAMAYOA TRANSPORTBrownfields · 2.3 mi
- ALTMAN SPECIALTY PLANTSBrownfields · 2.4 mi
- AT & T MOBILITYBrownfields · 2.8 mi
- RCIT MARSHELLBrownfields · 2.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Lake Mathews'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 Lake Mathews.
Sources Checked
within ~10 miles of Lake Mathews
Severity Distribution
within ~10 miles of Lake Mathews
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Lake Mathews, Brownfields runs higher than the national average — 1,949 sites within ~10 miles of Lake Mathews. 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 Lake Mathews
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 Lake Mathews average
Your land is one point inside Lake Mathews
Everything above resolves to Lake Mathews as a whole — one PHZM band, read across 10K acres, with hard-freeze dates borrowed from Riverside County’s record because no 30-year normal resolves at this town’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 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 Lake Mathews Average
Lake Mathews Average
- ●USDA Zones 10a, averaged across Lake Mathews
- ●One soil character for all of Lake Mathews
- ●Frost dates read at Lake Mathews's scale: Feb 13 to Dec 13
YOUR Parcel
- ✓Your exact zone, not Lake Mathews's 10a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Lake Mathews
Pull a site-specific report for your exact address in Lake Mathews, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Lake Mathews averages can't show:
We read public map data around Lake Mathews — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Lake Mathews average
How we know this about Lake Mathews
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 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 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 Lake Mathews
When does frost risk typically end in Lake Mathews?
The last hard freeze (28°F) in Lake Mathews 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 Lake Mathews?
The first hard freeze (28°F) in Lake Mathews 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 Lake Mathews?
Measured between 28°F hard freezes, Lake Mathews 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 Lake Mathews?
The federal record around Lake Mathews is a meaningful one — 2,192 documented sites, mostly Brownfields entries (1,949), the nearest Brownfields record about 0.5 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 Lake Mathews?
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 Lake Mathews's scale — its 10a band and its 303-day season. Your yard writes its own version of Lake Mathews'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 Lake Mathews’s own scale
4 of the readings below were taken at Lake Mathews's own scale — the 10,193 acres it covers and 2,192 documented sites around it; 6 are borrowed from a wider read, named and linked below.
Measured here
- Lake Mathews's own USDA hardiness band, zones 10aUSDA PHZM 2023
- 2,192 documented contamination sites on the federal record near Lake Mathews, the closest Brownfields record about 0.5 miles out from the town centreFederal environmental registers
- Lake Mathews's boundary and the 10,193 acres inside itUS Census TIGER/Line 2025
- Lake Mathews 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 — Lake Mathews 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 Lake Mathews's 10,193 acres read through its county's SSURGO summaryfrom Riverside 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 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 Lake Mathews's 10,193 acreswhy one lot differs from the next →
- Which side of Lake Mathews you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 10,193 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.5 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 Lake Mathews-wide figureread your own land →
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