Casselberry, Florida, sits in USDA hardiness zone 10a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
On paper, okra, meyer lemon, california poppy, and artichoke all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Casselberry, 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 Casselberry 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 Casselberry — soil, climate, flood, and parcel records. How we handle your address.
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Casselberry — the short answer
Casselberry, Florida: USDA zone 10a, about 333 days between hard freezes, across 4K acres of city.
- USDA zone
- 10a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jan 19
- Seminole County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 18
- Seminole County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~333
- Seminole County normal — NOAA 1991–2020, nearest to this town
- City area
- 4K 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 Seminole County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 10a is Casselberry's average, not your lot's — a low corner or a tree line moves it. Against Casselberry's 333-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Casselberry
Each reading below is measured for Casselberry itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsCasselberry runs about 333 days between hard freezes (read from Seminole County, the closest normal to Casselberry) — 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
MeasuredCasselberry 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 Casselberry is in
Casselberry sits in the Southern Coastal Plain — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Casselberry's own centroid rather than borrowed from Seminole County.
What Grows in Casselberry
Every plant below cleared Casselberry's own zone 10a and its 333-day season. Each card opens that plant's Florida profile. How we score.
Is it too late to plant in Casselberry?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Jan 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Jan 19 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 18 — long-season crops need about 90 days of runway, quick greens only 30. Here the calendar nearly circles: cool-season crops take the winter shift, and the next window is always close.
What's on the federal record near Casselberry
Closest first, within ~10 miles of Casselberry. Listing isn't leaking, and distance isn't exposure.
- SOUTH SEMINOLE MIDDLE SCHOOLBrownfields · 650 ft
- U HAUL OF SEMINOLEBrownfields · 1400 ft
- CASSELBERRY CITY - MARIGOLD LIFT STATIONUnderground Storage Tanks · 1700 ft
- CASSELBERRY GOLFUnderground Storage Tanks · 0.6 mi
- AIR FLOW DESIGNS INCUnderground Storage Tanks · 0.7 mi
- TEXACO #24-025-010Underground Storage Tanks · 0.7 mi
- CHEVRON #47967Underground Storage Tanks · 0.7 mi
- CUMBERLAND FARMS #0980Underground Storage Tanks · 0.8 mi
- FLORIDA DEP DSCP D116 #599502926Brownfields · 0.8 mi
- ROYAL AMC & JEEPUnderground Storage Tanks · 0.8 mi
- AAMCO TRANSMISSIONSUnderground Storage Tanks · 0.8 mi
- ROYAL JEEP EAGLE CHRYSLER PLYMOUTH INCUnderground Storage Tanks · 0.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Casselberry'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 Casselberry.
Sources Checked
within ~10 miles of Casselberry
Severity Distribution
within ~10 miles of Casselberry
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.
- •TRI facilities report what they release. Check the wind — downwind beds catch more of it.
Check your specific parcel in Casselberry
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 Casselberry average
Your land is one point inside Casselberry
Everything above resolves to Casselberry as a whole — one PHZM band, read across 4K acres, with hard-freeze dates borrowed from Seminole County’s record because no 30-year normal resolves at this city’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 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 Casselberry Average
Casselberry Average
- ●USDA Zones 10a, averaged across Casselberry
- ●One soil character for all of Casselberry
- ●Frost dates read at Casselberry's scale: Jan 19 to Dec 18
YOUR Parcel
- ✓Your exact zone, not Casselberry's 10a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Casselberry
Pull a site-specific report for your exact address in Casselberry, Florida — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Casselberry averages can't show:
We read public map data around Casselberry — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Casselberry average
How we know this about Casselberry
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 at Seminole 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 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 Casselberry
When does frost risk typically end in Casselberry?
The last hard freeze (28°F) in Casselberry typically lands around Jan 19, 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 Feb 9.
When is the first frost in Casselberry?
The first hard freeze (28°F) in Casselberry typically arrives around Dec 18, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Dec 4, so the watching starts about Nov 18 — about 333 days after the spring freeze cleared.
How long is the growing season in Casselberry?
Measured between 28°F hard freezes, Casselberry sees about 333 frost-free days — roughly Jan 19 through Dec 18, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 9 to Dec 4, about 298 days.
Is the soil safe to grow vegetables in Casselberry?
The federal record around Casselberry runs heavier than most — 2,617 documented sites, mostly Underground Storage Tanks entries (1,493), the nearest Brownfields record about 0.1 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.
How do I protect my plants from frost in Casselberry?
From about Nov 18 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 18 (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 18. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Casselberry's scale — its 10a band and its 333-day season. Your yard writes its own version of Casselberry'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 Casselberry’s own scale
5 of the readings below were taken at Casselberry's own scale — the 4,460 acres it covers and 2,617 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Casselberry's own USDA hardiness band, zones 10aUSDA PHZM 2023
- 2,617 documented contamination sites on the federal record near Casselberry, the closest Brownfields record about 0.1 miles out from the town centreFederal environmental registers
- Casselberry's boundary and the 4,460 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 10a and a ~333-day seasonGrowable Ground crop-matching engine
- The ecoregion at Casselberry's own centroid, the Southern Coastal PlainUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Casselberry has no normal of its own, so its county's is the closest measured readfrom Seminole County
- Soil character — no town-scale survey exists, so Casselberry's 4,460 acres read through its county's SSURGO summaryfrom Seminole County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Seminole 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 Seminole County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Casselberry's 4,460 acreswhy one lot differs from the next →
- Which side of Casselberry you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 4,460 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.1 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 Casselberry-wide figureread your own land →
More in Florida
Wider growing context
What grows across FloridaCasselberry sits outside our named growing regions, so Florida as a whole is its closest context here.
Nearby growing guides