San Juan Capistrano, California, sits in USDA hardiness zone 10b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Reliable performers under these conditions include artichoke, meyer lemon, california poppy, and cabbage; what your own ground favors still comes down to its soil, sun, and drainage.
Even in San Juan Capistrano, 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 San Juan Capistrano 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 San Juan Capistrano — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
San Juan Capistrano — the short answer
San Juan Capistrano, California: USDA zone 10b, no 28°F killing freeze on record — the season is year-round, across 9K acres of city.
- USDA zone
- 10b
- USDA PHZM 2023
- Killing freeze
- None on record
- NOAA RCC ACIS 1991–2020, this town’s own record
- City area
- 9K 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 10b is San Juan Capistrano's average, not your lot's — a low corner or a tree line moves it. Against San Juan Capistrano'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 San Juan Capistrano
Each reading below is measured for San Juan Capistrano itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Winter hardiness
MeasuredSan Juan Capistrano sits in USDA hardiness zone 10b.
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 San Juan Capistrano is in
San Juan Capistrano sits in the Southern California/Northern Baja Coast — EPA Level III, inside the wider Mediterranean California. That is read at San Juan Capistrano's own centroid rather than borrowed from Orange County.
What Grows in San Juan Capistrano
Every plant below cleared San Juan Capistrano's own zone 10b. Each card opens that plant's California profile. How we score.
What's on the federal record near San Juan Capistrano
Closest first, within ~10 miles of San Juan Capistrano. Listing isn't leaking, and distance isn't exposure.
- PRINTING OC.COM INC DBA PRINTING OCBrownfields · 300 ft
- CITY OF SAN JUAN CAPISTRANOPFAS · 450 ft
- SCP PLUMBING INCBrownfields · 800 ft
- ORTEGA CLEANERSBrownfields · 900 ft
- NICHOLAS J. SHUBIN, DDS, INCBrownfields · 950 ft
- CONOCOPHILLIPS #2705676Brownfields · 1000 ft
- CHEVRON 93160Brownfields · 1000 ft
- SHELL SERVICE STATIONBrownfields · 1100 ft
- VALVOLINE INSTANT OIL CHANGE GN0165Brownfields · 1200 ft
- Ortega ShellUnderground Storage Tanks · 1200 ft
- ORTEGA CENTER INC DBA ORTEGA SHELLBrownfields · 1200 ft
- TIMS PHOTO PROCESSINGBrownfields · 1400 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from San Juan Capistrano'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 San Juan Capistrano.
Total Sites
2,579
within ~10 miles of San Juan Capistrano
Risk Level
Elevated
Highest-severity
3 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of San Juan Capistrano
Severity Distribution
within ~10 miles of San Juan Capistrano
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around San Juan Capistrano, Brownfields runs higher than the national average — 2,364 sites within ~10 miles of San Juan Capistrano. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
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 San Juan Capistrano
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 San Juan Capistrano average
Your land is one point inside San Juan Capistrano
Everything above resolves to San Juan Capistrano as a whole — one PHZM band and one 28°F frost record, read across 9K 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 San Juan Capistrano Average
San Juan Capistrano Average
- ●USDA Zones 10b, averaged across San Juan Capistrano
- ●One soil character for all of San Juan Capistrano
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not San Juan Capistrano's 10b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in San Juan Capistrano
Pull a site-specific report for your exact address in San Juan Capistrano, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that San Juan Capistrano averages can't show:
We read public map data around San Juan Capistrano — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the San Juan Capistrano average
How we know this about San Juan Capistrano
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 San Juan Capistrano
Is it too late to plant in San Juan Capistrano?
No — San Juan Capistrano 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 San Juan Capistrano?
It doesn't — San Juan Capistrano 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 San Juan Capistrano?
Year-round — the 1991–2020 station record for San Juan Capistrano 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 San Juan Capistrano?
The federal record around San Juan Capistrano is a meaningful one — 2,579 documented sites, mostly Brownfields entries (2,364), the nearest Brownfields record under a tenth of a mile 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.
Everything above is measured at San Juan Capistrano's scale — its 10b band and its no killing freeze on record. Your yard writes its own version of San Juan Capistrano'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 San Juan Capistrano’s own scale
6 of the readings below were taken at San Juan Capistrano's own scale — the 9,235 acres it covers and 2,579 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- San Juan Capistrano's own USDA hardiness band, zones 10bUSDA PHZM 2023
- No 28°F killing freeze in the 30-year station record covering San Juan Capistrano — a year-round growing seasonNOAA Regional Climate Centers ACIS, 1991-2020
- 2,579 documented contamination sites on the federal record near San Juan Capistrano, the closest Brownfields record under a tenth of a mile out from the town centreFederal environmental registers
- San Juan Capistrano's boundary and the 9,235 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear San Juan Capistrano's hardiness zoneGrowable Ground crop-matching engine
- The ecoregion at San Juan Capistrano'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 San Juan Capistrano's 9,235 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 San Juan Capistrano's 9,235 acreswhy one lot differs from the next →
- Which side of San Juan Capistrano you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 9,235 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 San Juan Capistrano-wide figureread your own land →