Lake Ronkonkoma, New York, sits in USDA hardiness zone 7b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Well-matched crops include cabbage, prickly pear, california poppy, and collard greens, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Even in Lake Ronkonkoma, 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 Lake Ronkonkoma 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 Lake Ronkonkoma — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Lake Ronkonkoma — the short answer
Lake Ronkonkoma, New York: USDA zone 7b, about 237 days between hard freezes, across 3K 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 18
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~237
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 3K 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 Lake Ronkonkoma's average, not your lot's — a low corner or a tree line moves it. Against Lake Ronkonkoma's 237-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Lake Ronkonkoma
Each reading below is measured for Lake Ronkonkoma itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredLake Ronkonkoma runs about 237 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
MeasuredLake Ronkonkoma 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 Lake Ronkonkoma is in
Lake Ronkonkoma sits in the Atlantic Coastal Pine Barrens — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Lake Ronkonkoma's own centroid rather than borrowed from Suffolk County.
What Grows in Lake Ronkonkoma
Every plant below cleared Lake Ronkonkoma's own zone 7b and its 237-day season. Each card opens that plant's New York profile. How we score.
Is it too late to plant in Lake Ronkonkoma?
Rarely: the season closes in stages, not all at once, and each stage has its crops. 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 18 — long-season crops need about 90 days of runway, quick greens only 30. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
Documented around Lake Ronkonkoma
Spotted lanternfly documented 3 miles from Lake Ronkonkoma, first recorded 2020. What to watch for.
What's on the federal record near Lake Ronkonkoma
Closest first, within ~10 miles of Lake Ronkonkoma. Listing isn't leaking, and distance isn't exposure.
- S 47718. 1Nitrate · 850 ft
- 3J DRY CLEANERSBrownfields · 2100 ft
- SACHEM DENTAL GROUPBrownfields · 2400 ft
- LAKE RADIOLOGYBrownfields · 2600 ft
- HAWKINS CLEANERSBrownfields · 0.5 mi
- ALBERTSON PHOTO INC LAKE PHOTOBrownfields · 0.5 mi
- SACHEM CENTRAL SCHOOL DISTBrownfields · 0.5 mi
- ROYAL CLEANERSBrownfields · 0.5 mi
- TRIPLE X CLEANERSBrownfields · 0.5 mi
- FAMILY DOLLAR STORE 7999Brownfields · 0.5 mi
- ALKRIS PHOTO INC DBA LAKE FOTO DIGITALBrownfields · 0.5 mi
- OPTIONS FOR LIVINGBrownfields · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Lake Ronkonkoma'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 Lake Ronkonkoma.
Sources Checked
within ~10 miles of Lake Ronkonkoma
Severity Distribution
within ~10 miles of Lake Ronkonkoma
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Lake Ronkonkoma, Nitrate runs higher than the national average — 1,154 sites within ~10 miles of Lake Ronkonkoma. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
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 Lake Ronkonkoma
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 Lake Ronkonkoma average
Your land is one point inside Lake Ronkonkoma
Everything above resolves to Lake Ronkonkoma as a whole — one PHZM band and one 28°F frost record, read across 3K 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 Lake Ronkonkoma Average
Lake Ronkonkoma Average
- ●USDA Zones 7b, averaged across Lake Ronkonkoma
- ●One soil character for all of Lake Ronkonkoma
- ●Frost dates read at Lake Ronkonkoma's scale: Mar 26 to Nov 18
YOUR Parcel
- ✓Your exact zone, not Lake Ronkonkoma's 7b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Lake Ronkonkoma
Pull a site-specific report for your exact address in Lake Ronkonkoma, New York — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Lake Ronkonkoma averages can't show:
We read public map data around Lake Ronkonkoma — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Lake Ronkonkoma average
How we know this about Lake Ronkonkoma
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 Lake Ronkonkoma’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 Lake Ronkonkoma
When does frost risk typically end in Lake Ronkonkoma?
The last hard freeze (28°F) in Lake Ronkonkoma 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 Lake Ronkonkoma?
The first hard freeze (28°F) in Lake Ronkonkoma typically arrives around Nov 18, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 4, so the watching starts about Oct 19 — about 237 days after the spring freeze cleared.
How long is the growing season in Lake Ronkonkoma?
Measured between 28°F hard freezes, Lake Ronkonkoma sees about 237 frost-free days — roughly Mar 26 through Nov 18, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 16 to Nov 4, about 202 days.
Is the soil safe to grow vegetables in Lake Ronkonkoma?
The federal record around Lake Ronkonkoma runs heavier than most — 2,625 documented sites, mostly Brownfields entries (1,232), the nearest Nitrate record about 0.2 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 Lake Ronkonkoma?
From about Oct 19 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 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 Nov 18. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Lake Ronkonkoma's scale — its 7b band and its 237-day season. Your yard writes its own version of Lake Ronkonkoma'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 Lake Ronkonkoma’s own scale
7 of the readings below were taken at Lake Ronkonkoma's own scale — its own ~237-day season between 28°F freezes, the 2,903 acres it covers and 2,625 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Lake Ronkonkoma's own USDA hardiness band, zones 7bUSDA PHZM 2023
- Lake Ronkonkoma's own 28°F hard-freeze dates, about Mar 26 and Nov 18 and the ~237-day span between themNOAA 1991–2020 Climate Normals
- 2,625 documented contamination sites on the federal record near Lake Ronkonkoma, the closest Nitrate record about 0.2 miles out from the town centreFederal environmental registers
- Lake Ronkonkoma's boundary and the 2,903 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7b and a ~237-day seasonGrowable Ground crop-matching engine
- The ecoregion at Lake Ronkonkoma's own centroid, the Atlantic Coastal Pine BarrensUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Lake Ronkonkomalydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Lake Ronkonkoma's 2,903 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 Lake Ronkonkoma's 2,903 acreswhy one lot differs from the next →
- Which side of Lake Ronkonkoma you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,903 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate 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 Lake Ronkonkoma-wide figureread your own land →
More in New York
Growing region
Nearby growing guides