Last spring frost
Apr 15
Frost Dates for Setauket, NY
First fall frost
Nov 10
Growing season
208 days
Hardiness zone
7b
In an average year around Setauket, NY, the last spring frost (32°F) is about Apr 15 and the first fall frost is about Nov 10, giving roughly a 208-day growing season. To be safe most years, wait until Apr 1 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | May 15 | Apr 30 | Apr 15 |
| Freeze (32°F) | May 4 | Apr 15 | Apr 1 |
| Hard (28°F) | Apr 19 | Mar 31 | Mar 14 |
| Severe (24°F) | Apr 3 | Mar 18 | Mar 2 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 15 | May 10 | May 6 | May 3 | Apr 30 | Apr 26 | Apr 23 | Apr 19 | Apr 15 |
| 32°F | May 4 | Apr 29 | Apr 23 | Apr 18 | Apr 15 | Apr 12 | Apr 8 | Apr 5 | Apr 1 |
| 28°F | Apr 19 | Apr 9 | Apr 5 | Apr 3 | Mar 31 | Mar 29 | Mar 26 | Mar 21 | Mar 14 |
| 24°F | Apr 3 | Mar 30 | Mar 27 | Mar 22 | Mar 18 | Mar 15 | Mar 12 | Mar 8 | Mar 2 |
| 20°F | Mar 23 | Mar 16 | Mar 13 | Mar 10 | Mar 6 | Mar 4 | Feb 28 | Feb 25 | Feb 18 |
| 16°F | Mar 12 | Mar 6 | Mar 3 | Feb 28 | Feb 24 | Feb 19 | Feb 15 | Feb 9 | Feb 1 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Oct 14 | Oct 29 | Nov 10 |
| Freeze (32°F) | Oct 27 | Nov 10 | Nov 24 |
| Hard (28°F) | Nov 9 | Nov 21 | Dec 5 |
| Severe (24°F) | Nov 18 | Dec 3 | Dec 21 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 14 | Oct 19 | Oct 23 | Oct 26 | Oct 29 | Nov 1 | Nov 3 | Nov 6 | Nov 10 |
| 32°F | Oct 27 | Nov 1 | Nov 4 | Nov 7 | Nov 10 | Nov 12 | Nov 15 | Nov 19 | Nov 24 |
| 28°F | Nov 9 | Nov 13 | Nov 16 | Nov 19 | Nov 21 | Nov 25 | Nov 28 | Dec 1 | Dec 5 |
| 24°F | Nov 18 | Nov 23 | Nov 28 | Dec 1 | Dec 3 | Dec 6 | Dec 9 | Dec 15 | Dec 21 |
| 20°F | Dec 1 | Dec 4 | Dec 8 | Dec 11 | Dec 15 | Dec 20 | Dec 23 | Dec 29 | Jan 5 |
| 16°F | Dec 7 | Dec 14 | Dec 21 | Dec 25 | Dec 30 | Jan 3 | Jan 8 | Jan 14 | Jan 24 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Setauket Strong, Ny, about 1.3 miles away@if(!empty($station['elevation_ft'])), at 40 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Setauket, NY?
On average, the last spring frost (32°F) around Setauket, NY is about Apr 15. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 1.
When is the first frost in the fall?
The first fall frost around Setauket, NY typically arrives about Nov 10. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Apr 15 on average, or Apr 1 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 208 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 11733 Planting calendar → New York frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026