Fall in zone 4aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 99581 (Emmonak, AK)
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, Nome Muni AP, AK (119 miles away).
Use with caution
The nearest station is far away or at a very different elevation, so local dates may differ a lot.
- Average last spring frostJun 550% chance of a 32°F freeze after this date
- Average first fall frostSep 350% chance of a 32°F freeze by this date
- Growing season (frost-free)88 daysmedian, 32°F threshold
- USDA hardiness zone4a-30 to -25°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 99581 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
No vegetable planting windows are open this week.
Prune now
No frost-timed pruning windows are open this week.
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) | May 20 |
| 50% (the "average" last frost) | Jun 5 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 26 |
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) | Aug 15 |
| 50% (the "average" first frost) | Sep 3 |
| 90% (late: most years have frozen by now) | Sep 22 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | n/a | n/a |
| 32°F (freeze) | Jun 5 | Sep 3 |
| 28°F (hard freeze) | May 23 | Sep 19 |
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 99581
Dates count from your average last spring frost (Jun 5) and first fall frost (Sep 3). 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 | Apr 10–24 | Jun 12–26 (transplant) | – |
| Pepper (sweet and hot) | Mar 27–Apr 10 | Jun 19–Jul 3 (transplant) | – |
| Eggplant | Mar 27–Apr 10 | Jun 19–Jul 3 (transplant) | – |
| Tomatillo | Apr 10–24 | Jun 12–26 (transplant) | – |
| Lettuce | Apr 10–24 | May 15–Jun 5 (transplant) May 8–Jun 19 (sow outdoors) | Jul 9–30 (transplant) Jun 25–Jul 23 (sowing) |
| Spinach | – | Apr 24–May 15 (sow outdoors) | Jul 9–30 (sowing) |
| Kale | Apr 10–24 | May 8–22 (transplant) May 8–22 (sow outdoors) | Jun 11–Jul 9 (transplant) May 28–Jun 25 (sowing) |
| Collards | Apr 10–24 | May 8–Jun 5 (transplant) May 8–Jun 5 (sow outdoors) | Jun 11–Jul 9 (transplant) |
| Broccoli | Mar 27–Apr 10 | May 8–22 (transplant) | May 28–Jun 25 (transplant) |
| Cabbage | Mar 27–Apr 10 | May 8–22 (transplant) | May 28–Jun 25 (transplant) |
| Cauliflower | Mar 27–Apr 10 | May 22–Jun 5 (transplant) | – |
| Brussels sprouts | Mar 13–27 | May 8–22 (transplant) | – |
| Kohlrabi | Apr 10–24 | May 8–22 (transplant) May 8–22 (sow outdoors) | Jun 25–Jul 9 (sowing) |
| Bok choy / Asian greens | – | May 8–22 (sow outdoors) | Jul 9–23 (sowing) |
| Arugula | – | May 8–Jun 5 (sow outdoors) | Jul 9–Aug 6 (sowing) |
| Mustard greens | – | May 8–29 (sow outdoors) | Jul 9–23 (sowing) |
| Swiss chard | Apr 24–May 8 | May 22–Jun 12 (transplant) May 22–Jun 19 (sow outdoors) | Jun 25–Jul 9 (sowing) |
| Beet | – | May 8–Jun 5 (sow outdoors) | Jun 25–Jul 9 (sowing) |
| Carrot | – | May 15–Jun 12 (sow outdoors) | – |
| Radish | – | May 1–Jun 12 (sow outdoors) | Jul 23–Aug 6 (sowing) |
| Turnip | – | May 8–29 (sow outdoors) | Jun 25–Jul 9 (sowing) |
| Parsnip | – | May 15–Jun 5 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 10–May 8 (sow outdoors) | Jun 11–25 (sowing) |
| Onion (bulbing) | Mar 13–27 | Apr 24–May 8 (transplant) | – |
| Green onion / scallion | – | Apr 24–May 22 (sow outdoors) | Jun 25–Jul 9 (sowing) |
| Leek | Mar 13–27 | May 8–22 (transplant) | – |
| Garlic | – | – | Jul 23–Aug 20 (sowing) |
| Shallot | – | Apr 24–May 8 (transplant) | Jul 23–Aug 20 (sowing) |
| Potato | – | May 8–22 (transplant) | – |
| Sweet potato | – | Jun 26–Jul 10 (transplant) | – |
| Sweet corn | – | Jun 12–26 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 12–26 (sow outdoors) | – |
| Bean, pole | – | Jun 12–26 (sow outdoors) | – |
| Lima bean | – | Jun 19–Jul 3 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 26–Jul 17 (sow outdoors) | – |
| Cucumber | May 8–15 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Summer squash / zucchini | May 8–15 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Winter squash | May 8–15 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Pumpkin | – | Jun 12–26 (sow outdoors) | – |
| Watermelon | May 8–15 | Jun 19–Jul 3 (transplant) Jun 19–Jul 3 (sow outdoors) | – |
| Cantaloupe / muskmelon | May 8–15 | Jun 19–Jul 3 (transplant) Jun 19–Jul 3 (sow outdoors) | – |
| Okra | Apr 24–May 8 | Jun 19–Jul 3 (transplant) Jun 19–Jul 3 (sow outdoors) | – |
| Celery | Mar 13–27 | Jun 12–19 (transplant) | – |
| Basil | Apr 24–May 8 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Cilantro | – | May 22–Jun 19 (sow outdoors) | Jul 9–23 (sowing) |
| Parsley | Mar 27–Apr 10 | May 22–Jun 5 (transplant) May 15–Jun 5 (sow outdoors) | – |
| Dill | – | Jun 5–19 (sow outdoors) | Jul 9–23 (sowing) |
| Sunflower | – | Jun 5–19 (sow outdoors) | – |
| Asparagus (crowns) | – | May 8–22 (transplant) | – |
| Rhubarb (crowns) | – | May 8–22 (transplant) | – |
| Strawberry (plants) | – | May 8–22 (transplant) | Jun 25–Jul 23 (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: Nome Muni AP, AK (NOAA GHCN-Daily ID USW00026617), elevation 13 ft, 118.8 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|
Frost questions for 99581
When is the last frost in 99581?
The average (50% chance) last spring freeze of 32°F for ZIP 99581 is June 5. For a more cautious planting date, use June 26, when only 1 year in 10 still sees a later freeze.
When is the first frost in 99581?
The average first fall freeze is September 3. In 1 year in 10 it comes by August 15.
What hardiness zone is 99581?
ZIP 99581 is in USDA zone 4a (-30 to -25°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 99581 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
99554 Alakanuk 99666 Nunam Iqua 99620 Kotlik 99632 Mountain Village 99658 St. Mary's 99662 Scammon Bay 99650 Pilot Station 99671 Stebbins
Other ZIP codes in Kusilvak Census Area
99554 99563 99585 99604 99620 99632 99650 99657 99658 99662 99666 All Kusilvak Census Area frost dates · Alaska frost dates
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