Frost dates for ZIP 11784 (Selden, 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, Mt Sinai, NY (5 miles away).
- Average last spring frostApr 450% chance of a 32°F freeze after this date
- Average first fall frostNov 750% chance of a 32°F freeze by this date
- Growing season (frost-free)215 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 17, 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 11784 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 7: 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) | Mar 23 |
| 50% (the "average" last frost) | Apr 4 |
| 10% (cautious: only 1 year in 10 freezes later) | Apr 19 |
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 20 |
| 50% (the "average" first frost) | Nov 7 |
| 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 20 | Oct 26 |
| 32°F (freeze) | Apr 4 | Nov 7 |
| 28°F (hard freeze) | Mar 27 | Nov 22 |
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 11784
Dates count from your average last spring frost (Apr 4) and first fall frost (Nov 7). 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 7–21 | Apr 11–25 (transplant) | Jul 11–Aug 8 (transplant) |
| Pepper (sweet and hot) | Jan 24–Feb 7 | Apr 18–May 2 (transplant) | Jul 18–Aug 8 (transplant) |
| Eggplant | Jan 24–Feb 7 | Apr 18–May 2 (transplant) | Jul 18–Aug 8 (transplant) |
| Tomatillo | Feb 7–21 | Apr 11–25 (transplant) | – |
| Lettuce | Feb 7–21 | Mar 14–Apr 4 (transplant) Mar 7–Apr 18 (sow outdoors) | Sep 12–Oct 3 (transplant) Aug 29–Sep 26 (sowing) |
| Spinach | – | Feb 21–Mar 14 (sow outdoors) | Sep 12–Oct 3 (sowing) |
| Kale | Feb 7–21 | Mar 7–21 (transplant) Mar 7–21 (sow outdoors) | Aug 15–Sep 12 (transplant) Aug 1–29 (sowing) |
| Collards | Feb 7–21 | Mar 7–Apr 4 (transplant) Mar 7–Apr 4 (sow outdoors) | Aug 15–Sep 12 (transplant) Aug 1–29 (sowing) |
| Broccoli | Jan 24–Feb 7 | Mar 7–21 (transplant) | Aug 1–29 (transplant) |
| Cabbage | Jan 24–Feb 7 | Mar 7–21 (transplant) | Aug 1–29 (transplant) |
| Cauliflower | Jan 24–Feb 7 | Mar 21–Apr 4 (transplant) | Aug 1–29 (transplant) |
| Brussels sprouts | Jan 10–24 | Mar 7–21 (transplant) | Jul 18–Aug 8 (transplant) |
| Kohlrabi | Feb 7–21 | Mar 7–21 (transplant) Mar 7–21 (sow outdoors) | Aug 29–Sep 12 (sowing) |
| Bok choy / Asian greens | – | Mar 7–21 (sow outdoors) | Sep 12–26 (sowing) |
| Arugula | – | Mar 7–Apr 4 (sow outdoors) | Sep 12–Oct 10 (sowing) |
| Mustard greens | – | Mar 7–28 (sow outdoors) | Sep 12–26 (sowing) |
| Swiss chard | Feb 21–Mar 7 | Mar 21–Apr 11 (transplant) Mar 21–Apr 18 (sow outdoors) | Aug 29–Sep 12 (sowing) |
| Beet | – | Mar 7–Apr 4 (sow outdoors) | Aug 29–Sep 12 (sowing) |
| Carrot | – | Mar 14–Apr 11 (sow outdoors) | Aug 15–29 (sowing) |
| Radish | – | Feb 28–Apr 11 (sow outdoors) | Sep 26–Oct 10 (sowing) |
| Turnip | – | Mar 7–28 (sow outdoors) | Aug 29–Sep 12 (sowing) |
| Parsnip | – | Mar 14–Apr 4 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 7–Mar 7 (sow outdoors) | Aug 15–29 (sowing) |
| Onion (bulbing) | Jan 10–24 | Feb 21–Mar 7 (transplant) | – |
| Green onion / scallion | – | Feb 21–Mar 21 (sow outdoors) | Aug 29–Sep 12 (sowing) |
| Leek | Jan 10–24 | Mar 7–21 (transplant) | – |
| Garlic | – | – | Sep 26–Oct 24 (sowing) |
| Shallot | – | Feb 21–Mar 7 (transplant) | Sep 26–Oct 24 (sowing) |
| Potato | – | Mar 7–21 (transplant) | Jul 18–Aug 1 (transplant) |
| Sweet potato | – | Apr 25–May 9 (transplant) | – |
| Sweet corn | – | Apr 11–25 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 11–25 (sow outdoors) | Aug 15–29 (sowing) |
| Bean, pole | – | Apr 11–25 (sow outdoors) | – |
| Lima bean | – | Apr 18–May 2 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Apr 25–May 16 (sow outdoors) | – |
| Cucumber | Mar 7–14 | Apr 11–25 (transplant) Apr 11–25 (sow outdoors) | Aug 15–29 (sowing) |
| Summer squash / zucchini | Mar 7–14 | Apr 11–25 (transplant) Apr 11–25 (sow outdoors) | Aug 15–29 (sowing) |
| Winter squash | Mar 7–14 | Apr 11–25 (transplant) Apr 11–25 (sow outdoors) | – |
| Pumpkin | – | Apr 11–25 (sow outdoors) | – |
| Watermelon | Mar 7–14 | Apr 18–May 2 (transplant) Apr 18–May 2 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 7–14 | Apr 18–May 2 (transplant) Apr 18–May 2 (sow outdoors) | – |
| Okra | Feb 21–Mar 7 | Apr 18–May 2 (transplant) Apr 18–May 2 (sow outdoors) | – |
| Celery | Jan 10–24 | Apr 11–18 (transplant) | – |
| Basil | Feb 21–Mar 7 | Apr 11–25 (transplant) Apr 11–25 (sow outdoors) | – |
| Cilantro | – | Mar 21–Apr 18 (sow outdoors) | Sep 12–26 (sowing) |
| Parsley | Jan 24–Feb 7 | Mar 21–Apr 4 (transplant) Mar 14–Apr 4 (sow outdoors) | – |
| Dill | – | Apr 4–18 (sow outdoors) | Sep 12–26 (sowing) |
| Sunflower | – | Apr 4–18 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 7–21 (transplant) | – |
| Rhubarb (crowns) | – | Mar 7–21 (transplant) | – |
| Strawberry (plants) | – | Mar 7–21 (transplant) | Aug 29–Sep 26 (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: Mt Sinai, NY (NOAA GHCN-Daily ID USC00305606), elevation 50 ft, 4.6 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Islip Li Macarthur AP, NY | 6 mi | Apr 10 | Nov 2 |
| Setauket Strong, NY | 7 mi | Apr 15 | Nov 10 |
| Upton Coop - Nwsfo New York, NY | 9 mi | Apr 21 | Oct 24 |
The average last-frost dates of these stations span 17 days, a rough guide to local variation. See data sources & methods.
Frost questions for 11784
When is the last frost in 11784?
The average (50% chance) last spring freeze of 32°F for ZIP 11784 is April 4. For a more cautious planting date, use April 19, when only 1 year in 10 still sees a later freeze.
When is the first frost in 11784?
The average first fall freeze is November 7. In 1 year in 10 it comes by October 20.
What hardiness zone is 11784?
ZIP 11784 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 11784 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
11720 Centereach 11738 Farmingville 11727 Coram 11776 Terryville 11755 Lake Grove 11742 Holtsville 11763 Medford 11766 Mount Sinai
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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