San Castle, Florida, sits in USDA hardiness zone 10b — a zone band wide enough that plant choice, not possibility, is the interesting question.
A short list that earns its place here — artichoke, meyer lemon, california poppy, and cabbage — with any one site's soil, sun, and drainage making the final cut.
Even in San Castle, 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 Castle 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 Castle — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
San Castle — the short answer
San Castle, Florida: USDA zone 10b, no 28°F killing freeze on record — the season is year-round, across 269 acres of town.
- USDA zone
- 10b
- USDA PHZM 2023
- Killing freeze
- None on record
- NOAA RCC ACIS 1991–2020, this town’s own record
- Town area
- 269 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 Castle's average, not your lot's — a low corner or a tree line moves it. Against San Castle'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 Castle
Each reading below is measured for San Castle itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Winter hardiness
MeasuredSan Castle 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 Castle is in
San Castle sits in the Southern Florida Coastal Plain — EPA Level III, inside the wider Tropical Wet Forests. That is read at San Castle's own centroid rather than borrowed from Palm Beach County.
What Grows in San Castle
Every plant below cleared San Castle's own zone 10b. Each card opens that plant's Florida profile. How we score.
What's on the federal record near San Castle
Closest first, within ~10 miles of San Castle. Listing isn't leaking, and distance isn't exposure.
- PALM BEACH MEMORIAL PARKUnderground Storage Tanks · 1900 ft
- EISLER PROPERTYUnderground Storage Tanks · 2000 ft
- LONGBOTTOMS AUTO SERVICE-GASWAY PETROLUnderground Storage Tanks · 2200 ft
- JAY'S AUTOBrownfields · 2600 ft
- HYPOLUXO CHEVRONUnderground Storage Tanks · 2600 ft
- TIRE KINGDOM #6033Brownfields · 2600 ft
- TIRES PLUS LLC #5064Brownfields · 2600 ft
- HOME DEPOT STORE #3118Brownfields · 0.5 mi
- TRAILER LOT ABANDONEDUnderground Storage Tanks · 0.5 mi
- KULIN PROPERTIES LTDUnderground Storage Tanks · 0.5 mi
- SEARS DEPARTMENT STOREUnderground Storage Tanks · 0.5 mi
- RACETRAC #2385Underground Storage Tanks · 0.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from San Castle'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 Castle.
Total Sites
1,891
within ~10 miles of San Castle
Risk Level
Elevated
Highest-severity
5 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of San Castle
Severity Distribution
within ~10 miles of San Castle
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •Near a brownfield, raised beds of imported soil give your food clean ground.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in San Castle
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 Castle average
Your land is one point inside San Castle
Everything above resolves to San Castle as a whole — one PHZM band and one 28°F frost record, read across 269 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 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 San Castle Average
San Castle Average
- ●USDA Zones 10b, averaged across San Castle
- ●One soil character for all of San Castle
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not San Castle's 10b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in San Castle
Pull a site-specific report for your exact address in San Castle, Florida — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that San Castle averages can't show:
We read public map data around San Castle — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the San Castle average
How we know this about San Castle
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, 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 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 San Castle
Is it too late to plant in San Castle?
No — San Castle 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 Castle?
It doesn't — San Castle 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 Castle?
Year-round — the 1991–2020 station record for San Castle 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 Castle?
The federal record around San Castle is a meaningful one — 1,891 documented sites, mostly Underground Storage Tanks entries (1,015), the nearest Underground Storage Tanks record about 0.4 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.
Everything above is measured at San Castle's scale — its 10b band and its no killing freeze on record. Your yard writes its own version of San Castle'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 Castle’s own scale
6 of the readings below were taken at San Castle's own scale — the 269 acres it covers and 1,891 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- San Castle's own USDA hardiness band, zones 10bUSDA PHZM 2023
- No 28°F killing freeze in the 30-year station record covering San Castle — a year-round growing seasonNOAA Regional Climate Centers ACIS, 1991-2020
- 1,891 documented contamination sites on the federal record near San Castle, the closest Underground Storage Tanks record about 0.4 miles out from the town centreFederal environmental registers
- San Castle's boundary and the 269 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear San Castle's hardiness zoneGrowable Ground crop-matching engine
- The ecoregion at San Castle's own centroid, the Southern Florida Coastal PlainUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so San Castle's 269 acres read through its county's SSURGO summaryfrom Palm Beach County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Palm Beach County
- The growing challenges every Florida grower plans around — written at state scale, so they stay on the state guidefrom Florida
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Palm Beach County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among San Castle's 269 acreswhy one lot differs from the next →
- Which side of San Castle you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 269 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.4 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 San Castle-wide figureread your own land →