Fall in zone 2bPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 99668 (Sleetmute, 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, Mcgrath AP, AK (102 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 frostMay 1350% chance of a 32°F freeze after this date
- Average first fall frostSep 1350% chance of a 32°F freeze by this date
- Growing season (frost-free)120 daysmedian, 32°F threshold
- USDA hardiness zone2b-45 to -40°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 99668 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 4 |
| 50% (the "average" last frost) | May 13 |
| 10% (cautious: only 1 year in 10 freezes later) | May 28 |
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 27 |
| 50% (the "average" first frost) | Sep 13 |
| 90% (late: most years have frozen by now) | Sep 27 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 25 | Aug 31 |
| 32°F (freeze) | May 13 | Sep 13 |
| 28°F (hard freeze) | May 4 | Sep 25 |
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 99668
Dates count from your average last spring frost (May 13) and first fall frost (Sep 13). 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 | Mar 18–Apr 1 | May 20–Jun 3 (transplant) | – |
| Pepper (sweet and hot) | Mar 4–18 | May 27–Jun 10 (transplant) | – |
| Eggplant | Mar 4–18 | May 27–Jun 10 (transplant) | – |
| Tomatillo | Mar 18–Apr 1 | May 20–Jun 3 (transplant) | – |
| Lettuce | Mar 18–Apr 1 | Apr 22–May 13 (transplant) Apr 15–May 27 (sow outdoors) | Jul 19–Aug 9 (transplant) Jul 5–Aug 2 (sowing) |
| Spinach | – | Apr 1–22 (sow outdoors) | Jul 19–Aug 9 (sowing) |
| Kale | Mar 18–Apr 1 | Apr 15–29 (transplant) Apr 15–29 (sow outdoors) | Jun 21–Jul 19 (transplant) Jun 7–Jul 5 (sowing) |
| Collards | Mar 18–Apr 1 | Apr 15–May 13 (transplant) Apr 15–May 13 (sow outdoors) | Jun 21–Jul 19 (transplant) Jun 7–Jul 5 (sowing) |
| Broccoli | Mar 4–18 | Apr 15–29 (transplant) | Jun 7–Jul 5 (transplant) |
| Cabbage | Mar 4–18 | Apr 15–29 (transplant) | Jun 7–Jul 5 (transplant) |
| Cauliflower | Mar 4–18 | Apr 29–May 13 (transplant) | Jun 7–Jul 5 (transplant) |
| Brussels sprouts | Feb 18–Mar 4 | Apr 15–29 (transplant) | May 24–Jun 14 (transplant) |
| Kohlrabi | Mar 18–Apr 1 | Apr 15–29 (transplant) Apr 15–29 (sow outdoors) | Jul 5–19 (sowing) |
| Bok choy / Asian greens | – | Apr 15–29 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Arugula | – | Apr 15–May 13 (sow outdoors) | Jul 19–Aug 16 (sowing) |
| Mustard greens | – | Apr 15–May 6 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Swiss chard | Apr 1–15 | Apr 29–May 20 (transplant) Apr 29–May 27 (sow outdoors) | Jul 5–19 (sowing) |
| Beet | – | Apr 15–May 13 (sow outdoors) | Jul 5–19 (sowing) |
| Carrot | – | Apr 22–May 20 (sow outdoors) | Jun 21–Jul 5 (sowing) |
| Radish | – | Apr 8–May 20 (sow outdoors) | Aug 2–16 (sowing) |
| Turnip | – | Apr 15–May 6 (sow outdoors) | Jul 5–19 (sowing) |
| Parsnip | – | Apr 22–May 13 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 18–Apr 15 (sow outdoors) | Jun 21–Jul 5 (sowing) |
| Onion (bulbing) | Feb 18–Mar 4 | Apr 1–15 (transplant) | – |
| Green onion / scallion | – | Apr 1–29 (sow outdoors) | Jul 5–19 (sowing) |
| Leek | Feb 18–Mar 4 | Apr 15–29 (transplant) | – |
| Garlic | – | – | Aug 2–30 (sowing) |
| Shallot | – | Apr 1–15 (transplant) | Aug 2–30 (sowing) |
| Potato | – | Apr 15–29 (transplant) | May 24–Jun 7 (transplant) |
| Sweet potato | – | Jun 3–17 (transplant) | – |
| Sweet corn | – | May 20–Jun 3 (sow outdoors) | – |
| Bean, bush (snap) | – | May 20–Jun 3 (sow outdoors) | – |
| Bean, pole | – | May 20–Jun 3 (sow outdoors) | – |
| Lima bean | – | May 27–Jun 10 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 3–24 (sow outdoors) | – |
| Cucumber | Apr 15–22 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Summer squash / zucchini | Apr 15–22 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Winter squash | Apr 15–22 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Pumpkin | – | May 20–Jun 3 (sow outdoors) | – |
| Watermelon | Apr 15–22 | May 27–Jun 10 (transplant) May 27–Jun 10 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 15–22 | May 27–Jun 10 (transplant) May 27–Jun 10 (sow outdoors) | – |
| Okra | Apr 1–15 | May 27–Jun 10 (transplant) May 27–Jun 10 (sow outdoors) | – |
| Celery | Feb 18–Mar 4 | May 20–27 (transplant) | – |
| Basil | Apr 1–15 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Cilantro | – | Apr 29–May 27 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Parsley | Mar 4–18 | Apr 29–May 13 (transplant) Apr 22–May 13 (sow outdoors) | – |
| Dill | – | May 13–27 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Sunflower | – | May 13–27 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 15–29 (transplant) | – |
| Rhubarb (crowns) | – | Apr 15–29 (transplant) | – |
| Strawberry (plants) | – | Apr 15–29 (transplant) | Jul 5–Aug 2 (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: Mcgrath AP, AK (NOAA GHCN-Daily ID USW00026510), elevation 333 ft, 102.0 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 99668
When is the last frost in 99668?
The average (50% chance) last spring freeze of 32°F for ZIP 99668 is May 13. For a more cautious planting date, use May 28, when only 1 year in 10 still sees a later freeze.
When is the first frost in 99668?
The average first fall freeze is September 13. In 1 year in 10 it comes by August 27.
What hardiness zone is 99668?
ZIP 99668 is in USDA zone 2b (-45 to -40°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 99668 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
99656 Red Devil 99575 Crooked Creek 99503 Anchorage 99557 Lime Village 99640 Nondalton 99602 Holy Cross 99675 Takotna 99665 Shageluk
Other ZIP codes in Bethel Census Area
99503 99551 99552 99557 99559 99561 99575 99578 99589 99607 99609 99614 99621 99622 99626 99630 99634 99637 99641 99651 99655 99656 99679 99680 All Bethel Census Area frost dates · Alaska frost dates
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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.