Sewall's Point, Florida, sits in USDA hardiness zone 10b — a zone band wide enough that plant choice, not possibility, is the interesting question.
Expect mango, tomato, orange, and sweet potato to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Sewall's Point, 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 Sewall's Point 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 Sewall's Point — soil, climate, flood, and parcel records. How we handle your address.
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Sewall's Point — the short answer
Sewall's Point, Florida: USDA zone 10b, about 330 days between hard freezes, across 754 acres of town.
- USDA zone
- 10b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jan 19
- Martin County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 15
- Martin County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~330
- Martin County normal — NOAA 1991–2020, nearest to this town
- Town area
- 754 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 Martin County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 10b is Sewall's Point's average, not your lot's — a low corner or a tree line moves it. Against Sewall's Point's 330-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Sewall's Point
Each reading below is measured for Sewall's Point itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsSewall's Point runs about 330 days between hard freezes (read from Martin County, the closest normal to Sewall's Point) — 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
MeasuredSewall's Point 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 Sewall's Point is in
Sewall's Point sits in the Southern Coastal Plain — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Sewall's Point's own centroid rather than borrowed from Martin County.
What Grows in Sewall's Point
Plants matched to Sewall's Point's USDA zones 10b, ordered by how much hardiness margin each has here — the ones with room to spare at both ends of this town's band lead. Each links to its full growing profile.
Is it too late to plant in Sewall's Point?
Usually not — gardeners here simply switch what goes in the ground as the season moves. 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 15 — long-season crops need about 90 days of runway, quick greens only 30. In a climate this gentle, “too late” hardly applies — the question becomes which crops prefer the cooler months ahead.
What's on the federal record near Sewall's Point
Closest first, within ~10 miles of Sewall's Point. Listing isn't leaking, and distance isn't exposure.
- LARRY M FREDERICKUnderground Storage Tanks · 0.7 mi
- JACK RUSSELLUnderground Storage Tanks · 1.0 mi
- CONQUISTADOR HOME OWNERS ASSOCUnderground Storage Tanks · 1.1 mi
- MARTIN COUNTY GOLF & COUNTRY CLUBBrownfields · 1.2 mi
- SE CUTOFF ROAD RIGHT OF WAYUnderground Storage Tanks · 1.3 mi
- MARTIN CNTY-ADMINISTRATION BLDGUnderground Storage Tanks · 1.3 mi
- STUART PETROLEUM MANAGEMENT INCUnderground Storage Tanks · 1.3 mi
- MARTIN CNTY GOLF COURSEUnderground Storage Tanks · 1.3 mi
- VALVOLINE INSTANT OIL CHANGEBrownfields · 1.3 mi
- HUTCHINSON ISLAND MARRIOTT RESORTUnderground Storage Tanks · 1.4 mi
- HUTCHINSON ISLAND MARRIOTTUnderground Storage Tanks · 1.4 mi
- STUART CITY-KRUGER STATIONUnderground Storage Tanks · 1.4 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Sewall's Point'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 Sewall's Point.
Sources Checked
within ~10 miles of Sewall's Point
Severity Distribution
within ~10 miles of Sewall's Point
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 Sewall's Point
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 Sewall's Point average
Your land is one point inside Sewall's Point
Everything above resolves to Sewall's Point as a whole — one PHZM band, read across 754 acres, with hard-freeze dates borrowed from Martin County’s record because no 30-year normal resolves at this town’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 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 Sewall's Point Average
Sewall's Point Average
- ●USDA Zones 10b, averaged across Sewall's Point
- ●One soil character for all of Sewall's Point
- ●Frost dates read at Sewall's Point's scale: Jan 19 to Dec 15
YOUR Parcel
- ✓Your exact zone, not Sewall's Point's 10b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Sewall's Point
Pull a site-specific report for your exact address in Sewall's Point, Florida — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Sewall's Point averages can't show:
We read public map data around Sewall's Point — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Sewall's Point average
How we know this about Sewall's Point
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 at Martin 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 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 Sewall's Point
When does frost risk typically end in Sewall's Point?
The last hard freeze (28°F) in Sewall's Point 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 Sewall's Point?
The first hard freeze (28°F) in Sewall's Point typically arrives around Dec 15, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Dec 1, so the watching starts about Nov 15 — about 330 days after the spring freeze cleared.
How long is the growing season in Sewall's Point?
Measured between 28°F hard freezes, Sewall's Point sees about 330 frost-free days — roughly Jan 19 through Dec 15, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 9 to Dec 1, about 295 days.
Is the soil safe to grow vegetables in Sewall's Point?
The federal record around Sewall's Point is a meaningful one — 707 documented sites, mostly Underground Storage Tanks entries (356), the nearest Underground Storage Tanks record about 0.7 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.
How do I protect my plants from frost in Sewall's Point?
From about Nov 15 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 15 (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 15. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Sewall's Point's scale — its 10b band and its 330-day season. Your yard writes its own version of Sewall's Point'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 Sewall's Point’s own scale
4 of the readings below were taken at Sewall's Point's own scale — the 754 acres it covers and 707 documented sites around it; 6 are borrowed from a wider read, named and linked below.
Measured here
- Sewall's Point's own USDA hardiness band, zones 10bUSDA PHZM 2023
- 707 documented contamination sites on the federal record near Sewall's Point, the closest Underground Storage Tanks record about 0.7 miles out from the town centreFederal environmental registers
- Sewall's Point's boundary and the 754 acres inside itUS Census TIGER/Line 2025
- The ecoregion at Sewall's Point's own centroid, the Southern Coastal PlainUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Sewall's Point has no normal of its own, so its county's is the closest measured readfrom Martin County
- Soil character — no town-scale survey exists, so Sewall's Point's 754 acres read through its county's SSURGO summaryfrom Martin County
- The candidate plant list — Florida's curated set, filtered to this zone band and re-ordered by how much margin each has herefrom Florida
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Martin 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 Martin County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Sewall's Point's 754 acreswhy one lot differs from the next →
- Which side of Sewall's Point you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 754 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.7 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 Sewall's Point-wide figureread your own land →