Fall in zone 3aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 99750 (Kivalina, 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, Kivalina AP, AK (1 miles away).
- Average last spring frostJun 1050% chance of a 32°F freeze after this date
- Average first fall frostSep 1150% chance of a 32°F freeze by this date
- Growing season (frost-free)92 daysmedian, 32°F threshold
- USDA hardiness zone3a-40 to -35°F avg. coldest night
Get The Dial for 99750 (Kivalina)
Frost and freeze alerts from the NWS forecast for 99750, the spring soil-temperature heads-up for pre-emergent, and a short weekly yard-timing email.
- Freeze alerts
- Soil-temp heads-up
- Weekly yard to-dos
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.
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 99750 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 24 |
| 50% (the "average" last frost) | Jun 10 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 23 |
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 26 |
| 50% (the "average" first frost) | Sep 11 |
| 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) | n/a | n/a |
| 32°F (freeze) | Jun 10 | Sep 11 |
| 28°F (hard freeze) | Jun 1 | Sep 24 |
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 99750
Dates count from your average last spring frost (Jun 10) and first fall frost (Sep 11). 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 15–29 | Jun 17–Jul 1 (transplant) | – |
| Pepper (sweet and hot) | Apr 1–15 | Jun 24–Jul 8 (transplant) | – |
| Eggplant | Apr 1–15 | Jun 24–Jul 8 (transplant) | – |
| Tomatillo | Apr 15–29 | Jun 17–Jul 1 (transplant) | – |
| Lettuce | Apr 15–29 | May 20–Jun 10 (transplant) May 13–Jun 24 (sow outdoors) | Jul 17–Aug 7 (transplant) Jul 3–31 (sowing) |
| Spinach | – | Apr 29–May 20 (sow outdoors) | Jul 17–Aug 7 (sowing) |
| Kale | Apr 15–29 | May 13–27 (transplant) May 13–27 (sow outdoors) | Jun 19–Jul 17 (transplant) Jun 5–Jul 3 (sowing) |
| Collards | Apr 15–29 | May 13–Jun 10 (transplant) May 13–Jun 10 (sow outdoors) | Jun 19–Jul 17 (transplant) |
| Broccoli | Apr 1–15 | May 13–27 (transplant) | Jun 5–Jul 3 (transplant) |
| Cabbage | Apr 1–15 | May 13–27 (transplant) | Jun 5–Jul 3 (transplant) |
| Cauliflower | Apr 1–15 | May 27–Jun 10 (transplant) | – |
| Brussels sprouts | Mar 18–Apr 1 | May 13–27 (transplant) | – |
| Kohlrabi | Apr 15–29 | May 13–27 (transplant) May 13–27 (sow outdoors) | Jul 3–17 (sowing) |
| Bok choy / Asian greens | – | May 13–27 (sow outdoors) | Jul 17–31 (sowing) |
| Arugula | – | May 13–Jun 10 (sow outdoors) | Jul 17–Aug 14 (sowing) |
| Mustard greens | – | May 13–Jun 3 (sow outdoors) | Jul 17–31 (sowing) |
| Swiss chard | Apr 29–May 13 | May 27–Jun 17 (transplant) May 27–Jun 24 (sow outdoors) | Jul 3–17 (sowing) |
| Beet | – | May 13–Jun 10 (sow outdoors) | Jul 3–17 (sowing) |
| Carrot | – | May 20–Jun 17 (sow outdoors) | Jun 19–Jul 3 (sowing) |
| Radish | – | May 6–Jun 17 (sow outdoors) | Jul 31–Aug 14 (sowing) |
| Turnip | – | May 13–Jun 3 (sow outdoors) | Jul 3–17 (sowing) |
| Parsnip | – | May 20–Jun 10 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 15–May 13 (sow outdoors) | Jun 19–Jul 3 (sowing) |
| Onion (bulbing) | Mar 18–Apr 1 | Apr 29–May 13 (transplant) | – |
| Green onion / scallion | – | Apr 29–May 27 (sow outdoors) | Jul 3–17 (sowing) |
| Leek | Mar 18–Apr 1 | May 13–27 (transplant) | – |
| Garlic | – | – | Jul 31–Aug 28 (sowing) |
| Shallot | – | Apr 29–May 13 (transplant) | Jul 31–Aug 28 (sowing) |
| Potato | – | May 13–27 (transplant) | – |
| Sweet potato | – | Jul 1–15 (transplant) | – |
| Sweet corn | – | Jun 17–Jul 1 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 17–Jul 1 (sow outdoors) | – |
| Bean, pole | – | Jun 17–Jul 1 (sow outdoors) | – |
| Lima bean | – | Jun 24–Jul 8 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jul 1–22 (sow outdoors) | – |
| Cucumber | May 13–20 | Jun 17–Jul 1 (transplant) Jun 17–Jul 1 (sow outdoors) | – |
| Summer squash / zucchini | May 13–20 | Jun 17–Jul 1 (transplant) Jun 17–Jul 1 (sow outdoors) | – |
| Winter squash | May 13–20 | Jun 17–Jul 1 (transplant) Jun 17–Jul 1 (sow outdoors) | – |
| Pumpkin | – | Jun 17–Jul 1 (sow outdoors) | – |
| Watermelon | May 13–20 | Jun 24–Jul 8 (transplant) Jun 24–Jul 8 (sow outdoors) | – |
| Cantaloupe / muskmelon | May 13–20 | Jun 24–Jul 8 (transplant) Jun 24–Jul 8 (sow outdoors) | – |
| Okra | Apr 29–May 13 | Jun 24–Jul 8 (transplant) Jun 24–Jul 8 (sow outdoors) | – |
| Celery | Mar 18–Apr 1 | Jun 17–24 (transplant) | – |
| Basil | Apr 29–May 13 | Jun 17–Jul 1 (transplant) Jun 17–Jul 1 (sow outdoors) | – |
| Cilantro | – | May 27–Jun 24 (sow outdoors) | Jul 17–31 (sowing) |
| Parsley | Apr 1–15 | May 27–Jun 10 (transplant) May 20–Jun 10 (sow outdoors) | – |
| Dill | – | Jun 10–24 (sow outdoors) | Jul 17–31 (sowing) |
| Sunflower | – | Jun 10–24 (sow outdoors) | – |
| Asparagus (crowns) | – | May 13–27 (transplant) | – |
| Rhubarb (crowns) | – | May 13–27 (transplant) | – |
| Strawberry (plants) | – | May 13–27 (transplant) | Jul 3–31 (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: Kivalina AP, AK (NOAA GHCN-Daily ID USW00026642), elevation 10 ft, 1.4 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|
Frost questions for 99750
When is the last frost in 99750?
The average (50% chance) last spring freeze of 32°F for ZIP 99750 is June 10. For a more cautious planting date, use June 23, when only 1 year in 10 still sees a later freeze.
When is the first frost in 99750?
The average first fall freeze is September 11. In 1 year in 10 it comes by August 26.
What hardiness zone is 99750?
ZIP 99750 is in USDA zone 3a (-40 to -35°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 99750 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
99761 Noatak 99766 Point Hope 99752 Red Dog Mine 99763 Noorvik 99749 Kiana 99736 Deering 99772 Shishmaref 99770 Selawik
Other ZIP codes in Northwest Arctic Borough
99727 99736 99749 99751 99752 99761 99763 99770 99773 99786 All Northwest Arctic Borough frost dates · Alaska frost dates
Never miss a frost: get The Dial
Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
- Freeze alerts
- Soil-temp heads-up
- Weekly yard to-dos
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.