When to plant in Mount Sinai, NY
USDA Zone 7bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Mount Sinai, New York — all computed from Mount Sinai's nearest NOAA weather station.
In zone 7b, Mount Sinai supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
MT SINAI · 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 Mount Sinai’s own odds, recorded at MT SINAI.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 7 | Apr 20 | Apr 6 | Oct 10 | Oct 26 | Nov 10 |
| 32°F | Apr 19 | Apr 4 | Mar 23 | Oct 20 | Nov 7 | Nov 24 |
| 28°F | Apr 7 | Mar 27 | Mar 11 | Nov 2 | Nov 22 | Dec 9 |
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 Mount Sinai, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 16 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.
Mount Sinai planting FAQ
When is the last spring frost in Mount Sinai, NY?
Mount Sinai'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 Mount Sinai, NY?
Expect Mount Sinai's first fall frost near November 7 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Mount Sinai in?
Mount Sinai 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 Mount Sinai?
Mount Sinai has about 217 frost-free days — a long growing season — between the average last spring frost (April 4) and first fall frost (November 7).
When should I plant tomatoes in Mount Sinai?
For Mount Sinai, 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 Mount Sinai
An email when it’s time to start seeds, transplant, and sow — timed to Mount Sinai’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Miller Place · 2 km
- Terryville · 4 km
- East Setauket · 7 km
- Coram · 7 km
- Rocky Point · 7 km
- Middle Island · 8 km
- Selden · 8 km
- Centereach · 10 km
Frost dates recorded at MT SINAI, 1 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 Mount Sinai, NY — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00305606. Retrieved from https://blissgarden.com/new-york/mount-sinai.