Seal Beach, 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.
Well-matched crops include artichoke, meyer lemon, california poppy, and cabbage, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Even in Seal Beach, 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 Seal Beach 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 Seal Beach — soil, climate, flood, and parcel records. How we handle your address.
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Seal Beach — the short answer
Seal Beach, California: USDA zone 10a, no 28°F killing freeze on record — the season is year-round, across 7K 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
- 7K 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 Seal Beach's average, not your lot's — a low corner or a tree line moves it. Against Seal Beach'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 Seal Beach
Each reading below is measured for Seal Beach itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Winter hardiness
MeasuredSeal Beach 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 Seal Beach is in
Seal Beach sits in the Southern California/Northern Baja Coast — EPA Level III, inside the wider Mediterranean California. That is read at Seal Beach's own centroid rather than borrowed from Orange County.
What Grows in Seal Beach
Every plant below cleared Seal Beach's own zone 10a. Each card opens that plant's California profile. How we score.
What's on the federal record near Seal Beach
Closest first, within ~10 miles of Seal Beach. Listing isn't leaking, and distance isn't exposure.
- 005S011W07L001SNitrate · 1000 ft
- 005S011W07C001SNitrate · 1900 ft
- 005S011W07C002SNitrate · 2000 ft
- NWS SEAL BEACHBrownfields · 2000 ft
- NWS SEAL BEACHToxics Release Inventory · 2000 ft
- THE BOEING COMPANYBrownfields · 2600 ft
- JAH Industries LLC DBA Leisure World 76Underground Storage Tanks · 0.5 mi
- JIMS CHEVRON SVCBrownfields · 0.6 mi
- DR. GANTESBrownfields · 0.6 mi
- H&S Energy Products LLC #2002Underground Storage Tanks · 0.6 mi
- DOLLAR TREE #05023Brownfields · 0.6 mi
- LIZBETH LAZURBrownfields · 0.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Seal Beach'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 Seal Beach.
Sources Checked
within ~10 miles of Seal Beach
Severity Distribution
within ~10 miles of Seal Beach
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Seal Beach, Brownfields runs higher than the national average — 10,388 sites within ~10 miles of Seal Beach. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around 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 Seal Beach
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 Seal Beach average
Your land is one point inside Seal Beach
Everything above resolves to Seal Beach as a whole — one PHZM band and one 28°F frost record, read across 7K 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 Seal Beach Average
Seal Beach Average
- ●USDA Zones 10a, averaged across Seal Beach
- ●One soil character for all of Seal Beach
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not Seal Beach's 10a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Seal Beach
Pull a site-specific report for your exact address in Seal Beach, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Seal Beach averages can't show:
We read public map data around Seal Beach — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Seal Beach average
How we know this about Seal Beach
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 Seal Beach
Is it too late to plant in Seal Beach?
No — Seal Beach 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 Seal Beach?
It doesn't — Seal Beach 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 Seal Beach?
Year-round — the 1991–2020 station record for Seal Beach 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 Seal Beach?
The federal record around Seal Beach runs heavier than most — 12,083 documented sites, mostly Brownfields entries (10,388), the nearest Nitrate record about 0.2 miles 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 Seal Beach's scale — its 10a band and its no killing freeze on record. Your yard writes its own version of Seal Beach'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 Seal Beach’s own scale
6 of the readings below were taken at Seal Beach's own scale — the 7,235 acres it covers and 12,083 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Seal Beach's own USDA hardiness band, zones 10aUSDA PHZM 2023
- No 28°F killing freeze in the 30-year station record covering Seal Beach — a year-round growing seasonNOAA Regional Climate Centers ACIS, 1991-2020
- 12,083 documented contamination sites on the federal record near Seal Beach, the closest Nitrate record about 0.2 miles out from the town centreFederal environmental registers
- Seal Beach's boundary and the 7,235 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear Seal Beach's hardiness zoneGrowable Ground crop-matching engine
- The ecoregion at Seal Beach'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 Seal Beach's 7,235 acres read through its county's SSURGO summaryfrom Orange County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Orange 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 Orange County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Seal Beach's 7,235 acreswhy one lot differs from the next →
- Which side of Seal Beach you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 7,235 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.2 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 Seal Beach-wide figureread your own land →