Sierra Madre, California, sits in USDA hardiness zone 10a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
The conditions favor artichoke, meyer lemon, california poppy, and cabbage, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Sierra Madre, 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 Sierra Madre 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 Sierra Madre — soil, climate, flood, and parcel records. How we handle your address.
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Sierra Madre — the short answer
Sierra Madre, California: USDA zone 10a, no 28°F killing freeze on record — the season is year-round, across 2K acres of city.
- USDA zone
- 10a
- USDA PHZM 2023
- Killing freeze
- None on record
- NOAA RCC ACIS 1991–2020, this town’s own record
- City area
- 2K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. The year-round finding is measured — a 30-year record with no 28°F killing freeze in it — never inferred from missing dates.
Hardiness Zone Range
Zone 10a is Sierra Madre's average, not your lot's — a low corner or a tree line moves it. Against Sierra Madre's no killing freeze on record, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Sierra Madre
Each reading below is measured for Sierra Madre itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Winter hardiness
MeasuredSierra Madre 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 Sierra Madre is in
Sierra Madre sits in the Southern California/Northern Baja Coast — EPA Level III, inside the wider Mediterranean California. That is read at Sierra Madre's own centroid rather than borrowed from Los Angeles County.
What Grows in Sierra Madre
Every plant below cleared Sierra Madre's own zone 10a. Each card opens that plant's California profile. How we score.
What's on the federal record near Sierra Madre
Closest first, within ~10 miles of Sierra Madre. Listing isn't leaking, and distance isn't exposure.
- MIKE HOFFMANBrownfields · 250 ft
- SAMBRANO, PETEBrownfields · 400 ft
- ALVIN LOPEZBrownfields · 1100 ft
- Frontier California: Sierra Madre COUnderground Storage Tanks · 1800 ft
- FRONTIER CALIFORNIA INCORPORATEDBrownfields · 1800 ft
- SIERRA MADRE INDEPENDENT HONDA SVCBrownfields · 2200 ft
- GERMAN AUTO RPRBrownfields · 2200 ft
- SIERRA MADRE VALERO INCBrownfields · 2500 ft
- SIERRA MADRE VALERO INCUnderground Storage Tanks · 2500 ft
- MICHAEL BECHTHOLDBrownfields · 2600 ft
- SIERRA MADRE-CITY, WATER DEPT.PFAS · 0.5 mi
- CANBEQ AUTOMOTIVEBrownfields · 0.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Sierra Madre'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 Sierra Madre.
Sources Checked
within ~10 miles of Sierra Madre
Severity Distribution
within ~10 miles of Sierra Madre
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Sierra Madre, Brownfields runs higher than the national average — 5,398 sites within ~10 miles of Sierra Madre. 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 Sierra Madre
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 Sierra Madre average
Your land is one point inside Sierra Madre
Everything above resolves to Sierra Madre as a whole — one PHZM band and one 28°F frost record, read across 2K 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 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 Sierra Madre Average
Sierra Madre Average
- ●USDA Zones 10a, averaged across Sierra Madre
- ●One soil character for all of Sierra Madre
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not Sierra Madre's 10a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Sierra Madre
Pull a site-specific report for your exact address in Sierra Madre, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Sierra Madre averages can't show:
We read public map data around Sierra Madre — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Sierra Madre average
How we know this about Sierra Madre
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, with the labelled statewide window where none resolves; 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 Sierra Madre
Is it too late to plant in Sierra Madre?
No — Sierra Madre has no 28°F killing freeze in the 30-year station record, so the growing season is year-round and there is no last-frost date to wait for. Planting is paced by rainfall, heat and daylength instead of by frost: start heat-lovers any month, and time cool-season crops (lettuce, brassicas, peas) for the cooler, wetter half of the year or for higher ground. Succession sowing every few weeks works all year, so the limit is what you can keep watered and harvested, not the calendar.
When does frost risk typically end in Sierra Madre?
It doesn't — Sierra Madre records no 28°F killing freeze at all across the 1991–2020 station record, so there is no spring frost date to plant after. Cold still matters with elevation: the higher you garden, the cooler the nights, and a few tropical crops sulk below about 60°F even where they never freeze.
How long is the growing season in Sierra Madre?
Year-round — the 1991–2020 station record for Sierra Madre contains no 28°F killing freeze, so there is no season to measure between freezes. What paces planting instead is heat, rainfall and daylength: the hottest, wettest stretch is the hard part for cool-season crops, not winter. Elevation is the one real exception — the higher you garden, the colder the nights get.
Is the soil safe to grow vegetables in Sierra Madre?
The federal record around Sierra Madre runs heavier than most — 6,015 documented sites, mostly Brownfields entries (5,398), the nearest Brownfields record under a tenth of a mile out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
Everything above is measured at Sierra Madre's scale — its 10a band and its no killing freeze on record. Your yard writes its own version of Sierra Madre'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 Sierra Madre’s own scale
6 of the readings below were taken at Sierra Madre's own scale — the 1,889 acres it covers and 6,015 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Sierra Madre's own USDA hardiness band, zones 10aUSDA PHZM 2023
- No 28°F killing freeze in the 30-year station record covering Sierra Madre — a year-round growing seasonNOAA Regional Climate Centers ACIS, 1991-2020
- 6,015 documented contamination sites on the federal record near Sierra Madre, the closest Brownfields record under a tenth of a mile out from the town centreFederal environmental registers
- Sierra Madre's boundary and the 1,889 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear Sierra Madre's hardiness zoneGrowable Ground crop-matching engine
- The ecoregion at Sierra Madre's own centroid, the Southern California/Northern Baja CoastUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Sierra Madre's 1,889 acres read through its county's SSURGO summaryfrom Los Angeles County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Los Angeles 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 Los Angeles County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Sierra Madre's 1,889 acreswhy one lot differs from the next →
- Which side of Sierra Madre you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,889 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record under a tenth of a mile 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 Sierra Madre-wide figureread your own land →