Sag Harbor, New York, sits in USDA hardiness zone 7a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Among the crops suited to this profile: cabbage, hazelnut, california poppy, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Sag Harbor, 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 Sag Harbor 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 Sag Harbor — soil, climate, flood, and parcel records. How we handle your address.
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Sag Harbor — the short answer
Sag Harbor, New York: USDA zone 7a, about 227 days between hard freezes, across 1K acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 14
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~227
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 1K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 7a is Sag Harbor's average, not your lot's — a low corner or a tree line moves it. Against Sag Harbor's 227-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Sag Harbor
Each reading below is measured for Sag Harbor itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSag Harbor runs about 227 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredSag Harbor sits in USDA hardiness zone 7a.
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 Sag Harbor is in
Sag Harbor sits in the Atlantic Coastal Pine Barrens — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Sag Harbor's own centroid rather than borrowed from Suffolk County.
What Grows in Sag Harbor
Every plant below cleared Sag Harbor's own zone 7a and its 227-day season. Each card opens that plant's New York profile. How we score.
Is it too late to plant in Sag Harbor?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 4; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 14 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
Documented around Sag Harbor
Spotted lanternfly documented 3 miles from Sag Harbor, first recorded 2023. What to watch for.
What's on the federal record near Sag Harbor
Closest first, within ~10 miles of Sag Harbor. Listing isn't leaking, and distance isn't exposure.
- PIERSON HIGH SCHOOLBrownfields · 1000 ft
- S 8844. 1Nitrate · 1100 ft
- S 62855. 1Nitrate · 2300 ft
- S 24323. 1Nitrate · 2300 ft
- SAG HARBOR YACHT YARDBrownfields · 2500 ft
- S 38917. 1Nitrate · 2500 ft
- S 48521. 1Nitrate · 2600 ft
- CHELSEA CROSSINGS 1 HOUR PHOTOBrownfields · 0.5 mi
- NATIONAL GRID SAG HARBOR MGP SITEBrownfields · 0.6 mi
- S 16668. 1Nitrate · 0.6 mi
- S 184. 1Nitrate · 0.6 mi
- WHALERS CLEANERSBrownfields · 0.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Sag Harbor'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 Sag Harbor.
Sources Checked
within ~10 miles of Sag Harbor
Severity Distribution
within ~10 miles of Sag Harbor
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Sag Harbor, Nitrate runs higher than the national average — 346 sites within ~10 miles of Sag Harbor. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Sag Harbor
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 Sag Harbor average
Your land is one point inside Sag Harbor
Everything above resolves to Sag Harbor as a whole — one PHZM band and one 28°F frost record, read across 1K 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 Sag Harbor Average
Sag Harbor Average
- ●USDA Zones 7a, averaged across Sag Harbor
- ●One soil character for all of Sag Harbor
- ●Frost dates read at Sag Harbor's scale: Apr 1 to Nov 14
YOUR Parcel
- ✓Your exact zone, not Sag Harbor's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Sag Harbor
Pull a site-specific report for your exact address in Sag Harbor, New York — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Sag Harbor averages can't show:
We read public map data around Sag Harbor — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Sag Harbor average
How we know this about Sag Harbor
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 Sag Harbor’s own record; 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 Sag Harbor
When does frost risk typically end in Sag Harbor?
The last hard freeze (28°F) in Sag Harbor typically lands around Apr 1, 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 Apr 22.
When is the first frost in Sag Harbor?
The first hard freeze (28°F) in Sag Harbor typically arrives around Nov 14, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 31, so the watching starts about Oct 15 — about 227 days after the spring freeze cleared.
How long is the growing season in Sag Harbor?
Measured between 28°F hard freezes, Sag Harbor sees about 227 frost-free days — roughly Apr 1 through Nov 14, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 22 to Oct 31, about 192 days.
Is the soil safe to grow vegetables in Sag Harbor?
The federal record around Sag Harbor is a meaningful one — 511 documented sites, mostly Nitrate entries (346), the nearest Brownfields record about 0.2 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 Sag Harbor?
From about Oct 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 Nov 14 (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 Nov 14. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Sag Harbor's scale — its 7a band and its 227-day season. Your yard writes its own version of Sag Harbor'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 Sag Harbor’s own scale
7 of the readings below were taken at Sag Harbor's own scale — its own ~227-day season between 28°F freezes, the 1,144 acres it covers and 511 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Sag Harbor's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Sag Harbor's own 28°F hard-freeze dates, about Apr 1 and Nov 14 and the ~227-day span between themNOAA 1991–2020 Climate Normals
- 511 documented contamination sites on the federal record near Sag Harbor, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- Sag Harbor's boundary and the 1,144 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~227-day seasonGrowable Ground crop-matching engine
- The ecoregion at Sag Harbor's own centroid, the Atlantic Coastal Pine BarrensUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Sag Harborlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Sag Harbor's 1,144 acres read through its county's SSURGO summaryfrom Suffolk County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Suffolk County
- The growing challenges every New York grower plans around — written at state scale, so they stay on the state guidefrom New York
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Suffolk County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Sag Harbor's 1,144 acreswhy one lot differs from the next →
- Which side of Sag Harbor you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,144 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Sag Harbor-wide figureread your own land →