Fall in zone 7aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 11947 (Jamesport, 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, Riverhead Rsch Farm, NY (7 miles away).
- Average last spring frostApr 650% chance of a 32°F freeze after this date
- Average first fall frostNov 950% chance of a 32°F freeze by this date
- Growing season (frost-free)215 daysmedian, 32°F threshold
- USDA hardiness zone7a0 to 5°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 11947 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 9: 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 27 |
| 50% (the "average" last frost) | Apr 6 |
| 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 28 |
| 50% (the "average" first frost) | Nov 9 |
| 90% (late: most years have frozen by now) | Nov 22 |
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 28 |
| 32°F (freeze) | Apr 6 | Nov 9 |
| 28°F (hard freeze) | Mar 28 | 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 11947
Dates count from your average last spring frost (Apr 6) and first fall frost (Nov 9). 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 9–23 | Apr 13–27 (transplant) | Jul 13–Aug 10 (transplant) |
| Pepper (sweet and hot) | Jan 26–Feb 9 | Apr 20–May 4 (transplant) | Jul 20–Aug 10 (transplant) |
| Eggplant | Jan 26–Feb 9 | Apr 20–May 4 (transplant) | Jul 20–Aug 10 (transplant) |
| Tomatillo | Feb 9–23 | Apr 13–27 (transplant) | – |
| Lettuce | Feb 9–23 | Mar 16–Apr 6 (transplant) Mar 9–Apr 20 (sow outdoors) | Sep 14–Oct 5 (transplant) Aug 31–Sep 28 (sowing) |
| Spinach | – | Feb 23–Mar 16 (sow outdoors) | Sep 14–Oct 5 (sowing) |
| Kale | Feb 9–23 | Mar 9–23 (transplant) Mar 9–23 (sow outdoors) | Aug 17–Sep 14 (transplant) Aug 3–31 (sowing) |
| Collards | Feb 9–23 | Mar 9–Apr 6 (transplant) Mar 9–Apr 6 (sow outdoors) | Aug 17–Sep 14 (transplant) Aug 3–31 (sowing) |
| Broccoli | Jan 26–Feb 9 | Mar 9–23 (transplant) | Aug 3–31 (transplant) |
| Cabbage | Jan 26–Feb 9 | Mar 9–23 (transplant) | Aug 3–31 (transplant) |
| Cauliflower | Jan 26–Feb 9 | Mar 23–Apr 6 (transplant) | Aug 3–31 (transplant) |
| Brussels sprouts | Jan 12–26 | Mar 9–23 (transplant) | Jul 20–Aug 10 (transplant) |
| Kohlrabi | Feb 9–23 | Mar 9–23 (transplant) Mar 9–23 (sow outdoors) | Aug 31–Sep 14 (sowing) |
| Bok choy / Asian greens | – | Mar 9–23 (sow outdoors) | Sep 14–28 (sowing) |
| Arugula | – | Mar 9–Apr 6 (sow outdoors) | Sep 14–Oct 12 (sowing) |
| Mustard greens | – | Mar 9–30 (sow outdoors) | Sep 14–28 (sowing) |
| Swiss chard | Feb 23–Mar 9 | Mar 23–Apr 13 (transplant) Mar 23–Apr 20 (sow outdoors) | Aug 31–Sep 14 (sowing) |
| Beet | – | Mar 9–Apr 6 (sow outdoors) | Aug 31–Sep 14 (sowing) |
| Carrot | – | Mar 16–Apr 13 (sow outdoors) | Aug 17–31 (sowing) |
| Radish | – | Mar 2–Apr 13 (sow outdoors) | Sep 28–Oct 12 (sowing) |
| Turnip | – | Mar 9–30 (sow outdoors) | Aug 31–Sep 14 (sowing) |
| Parsnip | – | Mar 16–Apr 6 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 9–Mar 9 (sow outdoors) | Aug 17–31 (sowing) |
| Onion (bulbing) | Jan 12–26 | Feb 23–Mar 9 (transplant) | – |
| Green onion / scallion | – | Feb 23–Mar 23 (sow outdoors) | Aug 31–Sep 14 (sowing) |
| Leek | Jan 12–26 | Mar 9–23 (transplant) | – |
| Garlic | – | – | Sep 28–Oct 26 (sowing) |
| Shallot | – | Feb 23–Mar 9 (transplant) | Sep 28–Oct 26 (sowing) |
| Potato | – | Mar 9–23 (transplant) | Jul 20–Aug 3 (transplant) |
| Sweet potato | – | Apr 27–May 11 (transplant) | – |
| Sweet corn | – | Apr 13–27 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 13–27 (sow outdoors) | Aug 17–31 (sowing) |
| Bean, pole | – | Apr 13–27 (sow outdoors) | – |
| Lima bean | – | Apr 20–May 4 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Apr 27–May 18 (sow outdoors) | – |
| Cucumber | Mar 9–16 | Apr 13–27 (transplant) Apr 13–27 (sow outdoors) | Aug 17–31 (sowing) |
| Summer squash / zucchini | Mar 9–16 | Apr 13–27 (transplant) Apr 13–27 (sow outdoors) | Aug 17–31 (sowing) |
| Winter squash | Mar 9–16 | Apr 13–27 (transplant) Apr 13–27 (sow outdoors) | – |
| Pumpkin | – | Apr 13–27 (sow outdoors) | – |
| Watermelon | Mar 9–16 | Apr 20–May 4 (transplant) Apr 20–May 4 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 9–16 | Apr 20–May 4 (transplant) Apr 20–May 4 (sow outdoors) | – |
| Okra | Feb 23–Mar 9 | Apr 20–May 4 (transplant) Apr 20–May 4 (sow outdoors) | – |
| Celery | Jan 12–26 | Apr 13–20 (transplant) | – |
| Basil | Feb 23–Mar 9 | Apr 13–27 (transplant) Apr 13–27 (sow outdoors) | – |
| Cilantro | – | Mar 23–Apr 20 (sow outdoors) | Sep 14–28 (sowing) |
| Parsley | Jan 26–Feb 9 | Mar 23–Apr 6 (transplant) Mar 16–Apr 6 (sow outdoors) | – |
| Dill | – | Apr 6–20 (sow outdoors) | Sep 14–28 (sowing) |
| Sunflower | – | Apr 6–20 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 9–23 (transplant) | – |
| Rhubarb (crowns) | – | Mar 9–23 (transplant) | – |
| Strawberry (plants) | – | Mar 9–23 (transplant) | Aug 31–Sep 28 (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: Riverhead Rsch Farm, NY (NOAA GHCN-Daily ID USC00307134), elevation 100 ft, 7.1 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Mattituck, NY | 5 mi | Apr 19 | Nov 1 |
| Westhamptn Gabreski AP, NY | 7 mi | May 7 | Oct 14 |
| Baiting Hollow, NY | 8 mi | Apr 24 | Oct 25 |
The average last-frost dates of these stations span 32 days, a rough guide to local variation. See data sources & methods.
Frost questions for 11947
When is the last frost in 11947?
The average (50% chance) last spring freeze of 32°F for ZIP 11947 is April 6. 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 11947?
The average first fall freeze is November 9. In 1 year in 10 it comes by October 28.
What hardiness zone is 11947?
ZIP 11947 is in USDA zone 7a (0 to 5°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 11947 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
11970 Jamesport 11948 Laurel 11931 Aquebogue 11901 Riverhead 11952 Mattituck 11946 Hampton Bays 11942 East Quogue 11956 New Suffolk
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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- 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.