When to plant in Central Islip, NY
USDA Zone 7bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Central Islip, New York — all computed from Central Islip's nearest NOAA weather station.
Zone 7b means many perennials and even some tender shrubs overwinter in Central Islip, while your frost dates still decide when annuals go out.
Frost probability
ISLIP LI MACARTHUR AP · 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 Central Islip’s own odds, recorded at ISLIP LI MACARTHUR AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 7 | Apr 23 | Apr 11 | Oct 8 | Oct 21 | Nov 4 |
| 32°F | Apr 25 | Apr 10 | Mar 31 | Oct 18 | Nov 2 | Nov 15 |
| 28°F | Apr 12 | Mar 30 | Mar 14 | Nov 1 | Nov 14 | Dec 1 |
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 Central Islip, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 19 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.
Central Islip planting FAQ
When is the last spring frost in Central Islip, NY?
On average, the last spring frost in Central Islip is around April 10 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Central Islip, NY?
In Central Islip, the first 32°F freeze of fall lands around November 2 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Central Islip in?
Central 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 Central Islip?
There are roughly 206 frost-free days in Central Islip (a moderate growing season), running from the average last frost around April 10 to the first fall frost near November 2.
When should I plant tomatoes in Central Islip?
In Central Islip, start tomato seeds indoors around February 13–February 27, then transplant seedlings outdoors around April 17 once the danger of frost has passed.
Never miss a window in Central Islip
An email when it’s time to start seeds, transplant, and sow — timed to Central Islip’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Hauppauge · 5 km
- Islip · 6 km
- North Bay Shore · 6 km
- Ronkonkoma · 6 km
- East Islip · 6 km
- Bay Shore · 8 km
- Nesconset · 8 km
- Smithtown · 8 km
Frost dates recorded at ISLIP LI MACARTHUR AP, 8 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 Central Islip, NY — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00004781. Retrieved from https://blissgarden.com/new-york/central-islip.