Frost dates for 11790 — Stony Brook, NY
Last spring frostApr 15median date
First fall frostNov 10median date
Growing season209 daysfrost-free
Hardiness zone7bZone 7b
How Stony Brook compares
- In 8 years out of 10, the last spring frost in Stony Brook falls between April 1 and May 4, a 33-day window. The first fall frost falls between October 27 and November 24.
- The median last frost is 18 days earlier than the New York median of May 3.
- Its 209-day growing season is longer than 90% of the 1,610 New York places with a regular frost season (state median 163 days).
- The last frost is 10 days later than the zone 7b median of Apr 5. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7b chart.
- The weather station records an average of 96 nights a year at or below 32°F.
- Compared with Brentwood, NY, 17 km away, the last frost here is 5 days later than there and the growing season is 3 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 1 |
| 50% (median) | April 15 |
| 10% (safe for tender plants) | May 4 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 27 |
| 50% (median) | November 10 |
| 90% (late) | November 24 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Stony Brook, NY
Frost dates for 11790 — Stony Brook, NY — last frost Apr 15, first frost Nov 10, zone 7b. whenisthelastfrost.com
Crop
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Start indoors: Jan 21 to Feb 4Transplant outside: Mar 18 to Apr 1
Start indoors: Feb 4 to Feb 18Transplant outside: Apr 29 to May 13
Start indoors: Feb 4 to Feb 18Transplant outside: Apr 29 to May 13
Start indoors: Feb 18 to Mar 4Transplant outside: Apr 22 to May 6
Start indoors: Feb 18 to Mar 4Transplant outside: Mar 25 to Apr 8Sow outdoors: Mar 18 to Apr 22Plant for fall: Sep 15 to Oct 13
Start indoors: Feb 18 to Mar 4Transplant outside: Mar 18 to Apr 1Sow outdoors: Mar 18 to Apr 1Plant for fall: Sep 1 to Sep 22
Start indoors: Feb 18 to Mar 4Transplant outside: Apr 1 to Apr 15Plant for fall: Aug 4 to Aug 25
Start indoors: Feb 18 to Mar 4Transplant outside: Mar 25 to Apr 8Plant for fall: Aug 4 to Aug 25
Start indoors: Feb 18 to Mar 4Transplant outside: Apr 1 to Apr 15Plant for fall: Aug 4 to Aug 25
Start indoors: Mar 4 to Mar 18Transplant outside: May 6 to May 20Sow outdoors: May 6 to May 20
Start indoors: Mar 4 to Mar 18Transplant outside: Apr 22 to May 6
Sow outdoors: Mar 4 to Mar 25Plant for fall: Aug 18 to Sep 8
Sow outdoors: Mar 4 to Mar 25Plant for fall: Sep 15 to Oct 6
Sow outdoors: Mar 11 to Apr 22Plant for fall: Sep 29 to Oct 20
Start indoors: Mar 18 to Mar 25Transplant outside: Apr 29 to May 6Sow outdoors: Apr 22 to May 6Plant for fall: Aug 25 to Sep 8
Start indoors: Mar 18 to Mar 25Sow outdoors: Apr 22 to May 6Plant for fall: Sep 1 to Sep 15
Start indoors: Mar 18 to Mar 25Sow outdoors: Apr 22 to May 6
Start indoors: Mar 18 to Mar 25Transplant outside: Apr 29 to May 13
Sow outdoors: Mar 25 to Apr 22Plant for fall: Aug 18 to Sep 1
Sow outdoors: Mar 25 to Apr 22Plant for fall: Sep 1 to Sep 15
Sow outdoors: Mar 25 to Apr 15
Sow outdoors: Apr 1 to Apr 29Plant for fall: Sep 1 to Sep 15
Sow outdoors: Apr 1 to Apr 22Plant for fall: Sep 15 to Oct 6
Sow outdoors: Apr 22 to May 13Plant for fall: Aug 25 to Sep 8
Sow outdoors: Apr 22 to May 6
Transplant outside: Apr 29 to May 20
Plant for fall: Oct 27 to Dec 1
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Stony Brook, NY
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 21 – Feb 4 | Mar 18 – Apr 1 | — | — |
| Peppers | Feb 4 – Feb 18 | Apr 29 – May 13 | — | — |
| Eggplant | Feb 4 – Feb 18 | Apr 29 – May 13 | — | — |
| Tomatoes | Feb 18 – Mar 4 | Apr 22 – May 6 | — | — |
| Lettuce | Feb 18 – Mar 4 | Mar 25 – Apr 8 | Mar 18 – Apr 22 | Sep 15 – Oct 13 |
| Kale | Feb 18 – Mar 4 | Mar 18 – Apr 1 | Mar 18 – Apr 1 | Sep 1 – Sep 22 |
| Broccoli | Feb 18 – Mar 4 | Apr 1 – Apr 15 | — | Aug 4 – Aug 25 |
| Cabbage | Feb 18 – Mar 4 | Mar 25 – Apr 8 | — | Aug 4 – Aug 25 |
| Cauliflower | Feb 18 – Mar 4 | Apr 1 – Apr 15 | — | Aug 4 – Aug 25 |
| Okra | Mar 4 – Mar 18 | May 6 – May 20 | May 6 – May 20 | — |
| Basil | Mar 4 – Mar 18 | Apr 22 – May 6 | — | — |
| Peas | — | — | Mar 4 – Mar 25 | Aug 18 – Sep 8 |
| Spinach | — | — | Mar 4 – Mar 25 | Sep 15 – Oct 6 |
| Radishes | — | — | Mar 11 – Apr 22 | Sep 29 – Oct 20 |
| Cucumbers | Mar 18 – Mar 25 | Apr 29 – May 6 | Apr 22 – May 6 | Aug 25 – Sep 8 |
| Zucchini & Summer Squash | Mar 18 – Mar 25 | — | Apr 22 – May 6 | Sep 1 – Sep 15 |
| Winter Squash & Pumpkins | Mar 18 – Mar 25 | — | Apr 22 – May 6 | — |
| Melons & Watermelon | Mar 18 – Mar 25 | Apr 29 – May 13 | — | — |
| Carrots | — | — | Mar 25 – Apr 22 | Aug 18 – Sep 1 |
| Beets | — | — | Mar 25 – Apr 22 | Sep 1 – Sep 15 |
| Potatoes | — | — | Mar 25 – Apr 15 | — |
| Swiss Chard | — | — | Apr 1 – Apr 29 | Sep 1 – Sep 15 |
| Cilantro | — | — | Apr 1 – Apr 22 | Sep 15 – Oct 6 |
| Green Beans | — | — | Apr 22 – May 13 | Aug 25 – Sep 8 |
| Sweet Corn | — | — | Apr 22 – May 6 | — |
| Sweet Potatoes | — | Apr 29 – May 20 | — | — |
| Garlic | — | — | — | Oct 27 – Dec 1 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Setauket Strong, NY weather station, 6 km away (elevation 39 ft (12 m)).
ZIP codes in Stony Brook: 11790 11794
Frost dates near Stony Brook
- Saint James Apr 15 · Nov 10
- East Setauket Apr 15 · Nov 10
- Lake Grove Apr 10 · Nov 2
- Centereach Apr 10 · Nov 2
- Port Jefferson Station Apr 4 · Nov 7
- Nesconset Apr 10 · Nov 2
- Port Jefferson Apr 4 · Nov 7
- Selden Apr 4 · Nov 7
Frequently asked questions
When is the last frost in Stony Brook, NY?
The median last spring frost in Stony Brook, NY is April 15. There is still about a 10% chance of frost after May 4, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Stony Brook, NY?
The median first fall frost is November 10, with about a 10% chance of frost before October 27.
How long is the growing season in Stony Brook, NY?
About 209 days between the median last spring frost and first fall frost.
What planting zone is Stony Brook, NY?
Stony Brook, NY is in USDA hardiness zone 7b.