Fall in zone 3aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 99737 (Deltana, 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, Dry Creek, AK (27 miles away).
Station is a bit far
The nearest station with freeze normals is over 40 km away, so dates here may be off by a week or more.
- Average last spring frostMay 3050% chance of a 32°F freeze after this date
- Average first fall frostAug 2450% chance of a 32°F freeze by this date
- Growing season (frost-free)84 daysmedian, 32°F threshold
- USDA hardiness zone3a-40 to -35°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 99737 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 16 |
| 50% (the "average" last frost) | May 30 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 13 |
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 9 |
| 50% (the "average" first frost) | Aug 24 |
| 90% (late: most years have frozen by now) | Sep 5 |
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) | May 30 | Aug 24 |
| 28°F (hard freeze) | May 18 | Sep 3 |
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 99737
Dates count from your average last spring frost (May 30) and first fall frost (Aug 24). 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 4–18 | Jun 6–20 (transplant) | – |
| Pepper (sweet and hot) | Mar 21–Apr 4 | Jun 13–27 (transplant) | – |
| Eggplant | Mar 21–Apr 4 | Jun 13–27 (transplant) | – |
| Tomatillo | Apr 4–18 | Jun 6–20 (transplant) | – |
| Lettuce | Apr 4–18 | May 9–30 (transplant) May 2–Jun 13 (sow outdoors) | Jun 29–Jul 20 (transplant) Jun 15–Jul 13 (sowing) |
| Spinach | – | Apr 18–May 9 (sow outdoors) | Jun 29–Jul 20 (sowing) |
| Kale | Apr 4–18 | May 2–16 (transplant) May 2–16 (sow outdoors) | Jun 1–29 (transplant) May 18–Jun 15 (sowing) |
| Collards | Apr 4–18 | May 2–30 (transplant) May 2–30 (sow outdoors) | Jun 1–29 (transplant) |
| Broccoli | Mar 21–Apr 4 | May 2–16 (transplant) | May 18–Jun 15 (transplant) |
| Cabbage | Mar 21–Apr 4 | May 2–16 (transplant) | May 18–Jun 15 (transplant) |
| Cauliflower | Mar 21–Apr 4 | May 16–30 (transplant) | – |
| Brussels sprouts | Mar 7–21 | May 2–16 (transplant) | – |
| Kohlrabi | Apr 4–18 | May 2–16 (transplant) May 2–16 (sow outdoors) | Jun 15–29 (sowing) |
| Bok choy / Asian greens | – | May 2–16 (sow outdoors) | Jun 29–Jul 13 (sowing) |
| Arugula | – | May 2–30 (sow outdoors) | Jun 29–Jul 27 (sowing) |
| Mustard greens | – | May 2–23 (sow outdoors) | Jun 29–Jul 13 (sowing) |
| Swiss chard | Apr 18–May 2 | May 16–Jun 6 (transplant) May 16–Jun 13 (sow outdoors) | Jun 15–29 (sowing) |
| Beet | – | May 2–30 (sow outdoors) | Jun 15–29 (sowing) |
| Carrot | – | May 9–Jun 6 (sow outdoors) | – |
| Radish | – | Apr 25–Jun 6 (sow outdoors) | Jul 13–27 (sowing) |
| Turnip | – | May 2–23 (sow outdoors) | Jun 15–29 (sowing) |
| Parsnip | – | May 9–30 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 4–May 2 (sow outdoors) | Jun 1–15 (sowing) |
| Onion (bulbing) | Mar 7–21 | Apr 18–May 2 (transplant) | – |
| Green onion / scallion | – | Apr 18–May 16 (sow outdoors) | Jun 15–29 (sowing) |
| Leek | Mar 7–21 | May 2–16 (transplant) | – |
| Garlic | – | – | Jul 13–Aug 10 (sowing) |
| Shallot | – | Apr 18–May 2 (transplant) | Jul 13–Aug 10 (sowing) |
| Potato | – | May 2–16 (transplant) | – |
| Sweet potato | – | Jun 20–Jul 4 (transplant) | – |
| Sweet corn | – | Jun 6–20 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 6–20 (sow outdoors) | – |
| Bean, pole | – | Jun 6–20 (sow outdoors) | – |
| Lima bean | – | Jun 13–27 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 20–Jul 11 (sow outdoors) | – |
| Cucumber | May 2–9 | Jun 6–20 (transplant) Jun 6–20 (sow outdoors) | – |
| Summer squash / zucchini | May 2–9 | Jun 6–20 (transplant) Jun 6–20 (sow outdoors) | – |
| Winter squash | May 2–9 | Jun 6–20 (transplant) Jun 6–20 (sow outdoors) | – |
| Pumpkin | – | Jun 6–20 (sow outdoors) | – |
| Watermelon | May 2–9 | Jun 13–27 (transplant) Jun 13–27 (sow outdoors) | – |
| Cantaloupe / muskmelon | May 2–9 | Jun 13–27 (transplant) Jun 13–27 (sow outdoors) | – |
| Okra | Apr 18–May 2 | Jun 13–27 (transplant) Jun 13–27 (sow outdoors) | – |
| Celery | Mar 7–21 | Jun 6–13 (transplant) | – |
| Basil | Apr 18–May 2 | Jun 6–20 (transplant) Jun 6–20 (sow outdoors) | – |
| Cilantro | – | May 16–Jun 13 (sow outdoors) | Jun 29–Jul 13 (sowing) |
| Parsley | Mar 21–Apr 4 | May 16–30 (transplant) May 9–30 (sow outdoors) | – |
| Dill | – | May 30–Jun 13 (sow outdoors) | Jun 29–Jul 13 (sowing) |
| Sunflower | – | May 30–Jun 13 (sow outdoors) | – |
| Asparagus (crowns) | – | May 2–16 (transplant) | – |
| Rhubarb (crowns) | – | May 2–16 (transplant) | – |
| Strawberry (plants) | – | May 2–16 (transplant) | Jun 15–Jul 13 (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: Dry Creek, AK (NOAA GHCN-Daily ID USC00502568), elevation 1,355 ft, 26.7 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Glennallen 64 N, AK | 29 mi | Jun 5 | Aug 24 |
| Delta Junction 20 SE, AK | 36 mi | Jun 5 | Aug 21 |
| Big Delta AP, AK | 40 mi | May 17 | Sep 7 |
The average last-frost dates of these stations span 19 days, a rough guide to local variation. See data sources & methods.
Frost questions for 99737
When is the last frost in 99737?
The average (50% chance) last spring freeze of 32°F for ZIP 99737 is May 30. For a more cautious planting date, use June 13, when only 1 year in 10 still sees a later freeze.
When is the first frost in 99737?
The average first fall freeze is August 24. In 1 year in 10 it comes by August 9.
What hardiness zone is 99737?
ZIP 99737 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 99737 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
99706 Healy Lake 99776 Tanacross 99586 Chistochina 99588 Mendeltna 99714 Harding-Birch Lakes 99729 Cantwell 99702 Eielson AFB 99705 Badger
Other ZIP codes in Southeast Fairbanks Census Area
99706 99732 99738 99764 99776 99780 All Southeast Fairbanks 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.