Roslyn Harbor, New York, sits in USDA hardiness zone 7b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
On paper, cabbage, prickly pear, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Roslyn 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 Roslyn 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 Roslyn Harbor — soil, climate, flood, and parcel records. How we handle your address.
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Roslyn Harbor — the short answer
Roslyn Harbor, New York: USDA zone 7b, about 244 days between hard freezes, across 762 acres of town.
- USDA zone
- 7b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 26
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 25
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~244
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 762 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 7b is Roslyn Harbor's average, not your lot's — a low corner or a tree line moves it. Against Roslyn Harbor's 244-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Roslyn Harbor
Each reading below is measured for Roslyn Harbor itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRoslyn Harbor runs about 244 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
MeasuredRoslyn Harbor sits in USDA hardiness zone 7b.
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 Roslyn Harbor is in
Roslyn Harbor sits in the Northeastern Coastal Zone — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Roslyn Harbor's own centroid rather than borrowed from Nassau County.
What Grows in Roslyn Harbor
Every plant below cleared Roslyn Harbor's own zone 7b and its 244-day season. Each card opens that plant's New York profile. How we score.
Is it too late to plant in Roslyn 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 Feb 26; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 26 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 25 — 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 Roslyn Harbor
Spotted lanternfly documented 0 miles from Roslyn Harbor, first recorded 2020. What to watch for.
What's on the federal record near Roslyn Harbor
Closest first, within ~10 miles of Roslyn Harbor. Listing isn't leaking, and distance isn't exposure.
- PALL CORPORATIONToxics Release Inventory · 2200 ft
- N 5708. 1Nitrate · 2300 ft
- ROSLYN SCHOOL DISTRICTBrownfields · 2300 ft
- RALLYE MOTORSBrownfields · 2300 ft
- PENN TOYOTA LTDBrownfields · 2400 ft
- N 6333. 1Nitrate · 0.6 mi
- GLEN DRY CLEANERSBrownfields · 0.6 mi
- CARRIAGE WORKS COLLISION & TOWING LTDBrownfields · 0.7 mi
- NORTH GLEN SERVICE STATIONBrownfields · 0.7 mi
- NORTH SHORE CAMERA INC - THE CAMERA COBrownfields · 0.7 mi
- LE FRENCH CLEANING & TAILORING LTDBrownfields · 0.7 mi
- NYSDOT RTE 25A ROSLYN VIADUCT OVER HEMPSTEAD HARBOR BIN #1060919Brownfields · 0.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Roslyn 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 Roslyn Harbor.
Sources Checked
within ~10 miles of Roslyn Harbor
Severity Distribution
within ~10 miles of Roslyn Harbor
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Roslyn Harbor, Nitrate runs higher than the national average — 2,428 sites within ~10 miles of Roslyn Harbor. That's not a problem with your land — it's information about 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 Roslyn 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 Roslyn Harbor average
Your land is one point inside Roslyn Harbor
Everything above resolves to Roslyn Harbor as a whole — one PHZM band and one 28°F frost record, read across 762 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 Roslyn Harbor Average
Roslyn Harbor Average
- ●USDA Zones 7b, averaged across Roslyn Harbor
- ●One soil character for all of Roslyn Harbor
- ●Frost dates read at Roslyn Harbor's scale: Mar 26 to Nov 25
YOUR Parcel
- ✓Your exact zone, not Roslyn Harbor's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Roslyn Harbor
Pull a site-specific report for your exact address in Roslyn Harbor, New York — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Roslyn Harbor averages can't show:
We read public map data around Roslyn Harbor — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Roslyn Harbor average
How we know this about Roslyn 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 Roslyn 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 Roslyn Harbor
When does frost risk typically end in Roslyn Harbor?
The last hard freeze (28°F) in Roslyn Harbor typically lands around Mar 26, 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 16.
When is the first frost in Roslyn Harbor?
The first hard freeze (28°F) in Roslyn Harbor typically arrives around Nov 25, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 11, so the watching starts about Oct 26 — about 244 days after the spring freeze cleared.
How long is the growing season in Roslyn Harbor?
Measured between 28°F hard freezes, Roslyn Harbor sees about 244 frost-free days — roughly Mar 26 through Nov 25, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 16 to Nov 11, about 209 days.
Is the soil safe to grow vegetables in Roslyn Harbor?
The federal record around Roslyn Harbor runs heavier than most — 5,061 documented sites, mostly Nitrate entries (2,428), the nearest Toxics Release Inventory record about 0.4 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 Roslyn Harbor?
From about Oct 26 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 25 (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 25. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Roslyn Harbor's scale — its 7b band and its 244-day season. Your yard writes its own version of Roslyn 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 Roslyn Harbor’s own scale
7 of the readings below were taken at Roslyn Harbor's own scale — its own ~244-day season between 28°F freezes, the 762 acres it covers and 5,061 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Roslyn Harbor's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Roslyn Harbor's own 28°F hard-freeze dates, about Mar 26 and Nov 25 and the ~244-day span between themNOAA 1991–2020 Climate Normals
- 5,061 documented contamination sites on the federal record near Roslyn Harbor, the closest Toxics Release Inventory record about 0.4 miles out from the town centreFederal environmental registers
- Roslyn Harbor's boundary and the 762 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~244-day seasonGrowable Ground crop-matching engine
- The ecoregion at Roslyn Harbor's own centroid, the Northeastern Coastal ZoneUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Roslyn Harborlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Roslyn Harbor's 762 acres read through its county's SSURGO summaryfrom Nassau County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Nassau 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 Nassau County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Roslyn Harbor's 762 acreswhy one lot differs from the next →
- Which side of Roslyn 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 762 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Toxics Release Inventory 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 Roslyn Harbor-wide figureread your own land →