When to plant in Islip, NY
USDA Zone 7bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Islip, New York — all computed from Islip's nearest NOAA weather station.
In zone 7b, Islip supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
MOLLOY CERCOM · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Islip’s own odds, recorded at MOLLOY CERCOM.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 8 | Apr 20 | Apr 5 | Oct 15 | Oct 30 | Nov 13 |
| 32°F | Apr 21 | Apr 4 | Mar 22 | Oct 27 | Nov 11 | Nov 29 |
| 28°F | Apr 5 | Mar 24 | Mar 9 | Nov 6 | Nov 24 | Dec 12 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Islip, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 17 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Islip planting FAQ
When is the last spring frost in Islip, NY?
Islip's average last spring frost falls near April 4 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Islip, NY?
Expect Islip's first fall frost near November 11 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Islip in?
Islip is in USDA hardiness zone 7b. In zone 7b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Islip?
Islip has about 221 frost-free days — a long growing season — between the average last spring frost (April 4) and first fall frost (November 11).
When should I plant tomatoes in Islip?
For Islip, sow tomatoes indoors about February 7–February 21 and move the seedlings out around April 11, after the last spring frost.
Never miss a window in Islip
An email when it’s time to start seeds, transplant, and sow — timed to Islip’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- East Islip · 2 km
- Bay Shore · 3 km
- North Bay Shore · 5 km
- Central Islip · 6 km
- West Islip · 7 km
- North Babylon · 9 km
- Deer Park · 10 km
- Babylon · 10 km
Frost dates recorded at MOLLOY CERCOM, 11 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Islip, NY — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00302151. Retrieved from https://blissgarden.com/new-york/islip.