Fall in zone 7bPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 11790 (Stony Brook, NY)
Average last spring and first fall frost dates with 10%, 50% and 90% odds, from NOAA's 1991–2020 climate normals for the nearest weather station, Setauket Strong, NY (4 miles away).
- Average last spring frostApr 1550% chance of a 32°F freeze after this date
- Average first fall frostNov 1050% chance of a 32°F freeze by this date
- Growing season (frost-free)208 daysmedian, 32°F threshold
- USDA hardiness zone7b5 to 10°F avg. coldest night
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This week in your yard
As of Oct 18, 2026, from your frost dates, zone and soil temperature. Lawn timing · Vegetables · Pruning · Plants
Soil temperature now
2-inch depth
No soil station with a fresh reading within 62 miles.
4-inch depth
No soil station with a fresh reading within 62 miles.
Fall: Texas A&M AgriLife times fall pre-emergent (for winter weeds such as annual bluegrass) to soil cooling to about 70°F for several days. The 50–55°F band is the spring trigger. Always read and follow the product label.
7-day forecast and frost risk
The latest National Weather Service 7-day forecast and any Frost Advisory or Freeze Warning for 11790 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
No soil reading near this ZIP. Typical extension timing for your region: spring mid-April to early May.
Fertilizer window
Lawn region: North (cool-season). Timing only; always follow the product label.
- Kentucky bluegrass (cool-season): Early fall: Around Labor Day (late August–September); Late fall: Late October–November, before the ground freezes; Late spring: Optional around Memorial Day. Avoid: Early-spring and midsummer feeding (pushes top growth, favors crabgrass).
Plant now
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Nov 10: skip heavy pruning in the 6–8 weeks before it, because new growth may not harden off in time.
Spring-flowering shrubs are pruned right after their flowers fade, not by date. See the pruning guide.
Last spring frost odds
| Chance of a 32°F freeze after this date | Date |
|---|---|
| 90% (early: most years still freeze after this) | Apr 1 |
| 50% (the "average" last frost) | Apr 15 |
| 10% (cautious: only 1 year in 10 freezes later) | May 4 |
Most gardeners plant frost-tender crops (tomatoes, peppers, basil) after the 50% date, and closer to the 10% date for less risk.
First fall frost odds
| Chance the first 32°F freeze has happened by this date | Date |
|---|---|
| 10% (early: 1 year in 10 freezes this soon) | Oct 27 |
| 50% (the "average" first frost) | Nov 10 |
| 90% (late: most years have frozen by now) | Nov 24 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Apr 30 | Oct 29 |
| 32°F (freeze) | Apr 15 | Nov 10 |
| 28°F (hard freeze) | Mar 31 | Nov 21 |
n/a means NOAA did not publish a date at that threshold for this station (usually because it rarely gets that cold).
Vegetable planting calendar for 11790
Dates count from your average last spring frost (Apr 15) and first fall frost (Nov 10). Half of years have a frost after the spring date, so give tender crops (tomatoes, peppers, squash) some slack.
| Crop | Start indoors | Spring planting | Fall planting |
|---|---|---|---|
| Tomato | Feb 18–Mar 4 | Apr 22–May 6 (transplant) | – |
| Pepper (sweet and hot) | Feb 4–18 | Apr 29–May 13 (transplant) | – |
| Eggplant | Feb 4–18 | Apr 29–May 13 (transplant) | – |
| Tomatillo | Feb 18–Mar 4 | Apr 22–May 6 (transplant) | – |
| Lettuce | Feb 18–Mar 4 | Mar 25–Apr 15 (transplant) Mar 18–Apr 29 (sow outdoors) | Sep 15–Oct 6 (transplant) Sep 1–29 (sowing) |
| Spinach | – | Mar 4–25 (sow outdoors) | Sep 15–Oct 6 (sowing) |
| Kale | Feb 18–Mar 4 | Mar 18–Apr 1 (transplant) Mar 18–Apr 1 (sow outdoors) | Aug 18–Sep 15 (transplant) Aug 4–Sep 1 (sowing) |
| Collards | Feb 18–Mar 4 | Mar 18–Apr 15 (transplant) Mar 18–Apr 15 (sow outdoors) | Aug 18–Sep 15 (transplant) Aug 4–Sep 1 (sowing) |
| Broccoli | Feb 4–18 | Mar 18–Apr 1 (transplant) | Aug 4–Sep 1 (transplant) |
| Cabbage | Feb 4–18 | Mar 18–Apr 1 (transplant) | Aug 4–Sep 1 (transplant) |
| Cauliflower | Feb 4–18 | Apr 1–15 (transplant) | Aug 4–Sep 1 (transplant) |
| Brussels sprouts | Jan 21–Feb 4 | Mar 18–Apr 1 (transplant) | Jul 21–Aug 11 (transplant) |
| Kohlrabi | Feb 18–Mar 4 | Mar 18–Apr 1 (transplant) Mar 18–Apr 1 (sow outdoors) | Sep 1–15 (sowing) |
| Bok choy / Asian greens | – | Mar 18–Apr 1 (sow outdoors) | Sep 15–29 (sowing) |
| Arugula | – | Mar 18–Apr 15 (sow outdoors) | Sep 15–Oct 13 (sowing) |
| Mustard greens | – | Mar 18–Apr 8 (sow outdoors) | Sep 15–29 (sowing) |
| Swiss chard | Mar 4–18 | Apr 1–22 (transplant) Apr 1–29 (sow outdoors) | Sep 1–15 (sowing) |
| Beet | – | Mar 18–Apr 15 (sow outdoors) | Sep 1–15 (sowing) |
| Carrot | – | Mar 25–Apr 22 (sow outdoors) | Aug 18–Sep 1 (sowing) |
| Radish | – | Mar 11–Apr 22 (sow outdoors) | Sep 29–Oct 13 (sowing) |
| Turnip | – | Mar 18–Apr 8 (sow outdoors) | Sep 1–15 (sowing) |
| Parsnip | – | Mar 25–Apr 15 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 18–Mar 18 (sow outdoors) | Aug 18–Sep 1 (sowing) |
| Onion (bulbing) | Jan 21–Feb 4 | Mar 4–18 (transplant) | – |
| Green onion / scallion | – | Mar 4–Apr 1 (sow outdoors) | Sep 1–15 (sowing) |
| Leek | Jan 21–Feb 4 | Mar 18–Apr 1 (transplant) | – |
| Garlic | – | – | Sep 29–Oct 27 (sowing) |
| Shallot | – | Mar 4–18 (transplant) | Sep 29–Oct 27 (sowing) |
| Potato | – | Mar 18–Apr 1 (transplant) | Jul 21–Aug 4 (transplant) |
| Sweet potato | – | May 6–20 (transplant) | – |
| Sweet corn | – | Apr 22–May 6 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 22–May 6 (sow outdoors) | – |
| Bean, pole | – | Apr 22–May 6 (sow outdoors) | – |
| Lima bean | – | Apr 29–May 13 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | May 6–27 (sow outdoors) | – |
| Cucumber | Mar 18–25 | Apr 22–May 6 (transplant) Apr 22–May 6 (sow outdoors) | – |
| Summer squash / zucchini | Mar 18–25 | Apr 22–May 6 (transplant) Apr 22–May 6 (sow outdoors) | – |
| Winter squash | Mar 18–25 | Apr 22–May 6 (transplant) Apr 22–May 6 (sow outdoors) | – |
| Pumpkin | – | Apr 22–May 6 (sow outdoors) | – |
| Watermelon | Mar 18–25 | Apr 29–May 13 (transplant) Apr 29–May 13 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 18–25 | Apr 29–May 13 (transplant) Apr 29–May 13 (sow outdoors) | – |
| Okra | Mar 4–18 | Apr 29–May 13 (transplant) Apr 29–May 13 (sow outdoors) | – |
| Celery | Jan 21–Feb 4 | Apr 22–29 (transplant) | – |
| Basil | Mar 4–18 | Apr 22–May 6 (transplant) Apr 22–May 6 (sow outdoors) | – |
| Cilantro | – | Apr 1–29 (sow outdoors) | Sep 15–29 (sowing) |
| Parsley | Feb 4–18 | Apr 1–15 (transplant) Mar 25–Apr 15 (sow outdoors) | – |
| Dill | – | Apr 15–29 (sow outdoors) | Sep 15–29 (sowing) |
| Sunflower | – | Apr 15–29 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 18–Apr 1 (transplant) | – |
| Rhubarb (crowns) | – | Mar 18–Apr 1 (transplant) | – |
| Strawberry (plants) | – | Mar 18–Apr 1 (transplant) | Sep 1–29 (transplant) |
Typical ranges from university extension planting calendars, adjusted to your frost dates. Probabilities, not guarantees. Fall windows that would overlap spring planting are left out, as are fall crops of frost-tender plants where the frost-free season is under 210 days.
Where these numbers come from
Station: Setauket Strong, NY (NOAA GHCN-Daily ID USC00307633), elevation 40 ft, 3.7 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Mt Sinai, NY | 6 mi | Apr 4 | Nov 7 |
| Islip Li Macarthur AP, NY | 8 mi | Apr 10 | Nov 2 |
| Centerport, NY | 13 mi | Apr 9 | Nov 10 |
The average last-frost dates of these stations span 11 days, a rough guide to local variation. See data sources & methods.
Frost questions for 11790
When is the last frost in 11790?
The average (50% chance) last spring freeze of 32°F for ZIP 11790 is April 15. For a more cautious planting date, use May 4, when only 1 year in 10 still sees a later freeze.
When is the first frost in 11790?
The average first fall freeze is November 10. In 1 year in 10 it comes by October 27.
What hardiness zone is 11790?
ZIP 11790 is in USDA zone 7b (5 to 10°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 11790 right now?
This page shows the latest 2-inch and 4-inch soil temperature from the nearest public soil station (USDA SCAN, NOAA USCRN or TexMesonet), or a labeled estimate when no station is close, against the 50–55°F spring pre-emergent band.
Nearby ZIP codes
11794 Stony Brook University 11780 St. James 11733 East Setauket 11755 Lake Grove 11720 Centereach 11767 Nesconset 11776 Terryville 11777 Port Jefferson
Other ZIP codes in Suffolk County
06390 11701 11702 11703 11704 11705 11706 11713 11715 11716 11717 11718 11719 11720 11721 11722 11724 11725 11726 11727 11729 11730 11731 11733 All Suffolk County frost dates · New York frost dates
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Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
- Freeze alerts
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Free. One weekly email plus alerts when your ZIP has a frost or a soil-temperature change worth acting on. After you submit, Kit (our email provider) sends a confirmation email: check your email and click the link to confirm. You aren't subscribed until you do. We collect only your email address and ZIP, sent to Kit to deliver The Dial. Unsubscribe anytime.