Frost dates for ZIP 99740 (Fort Yukon, 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, Central #2, AK (143 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 2550% chance of a 32°F freeze after this date
- Average first fall frostAug 2650% 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
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This week in your yard
As of Oct 17, 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 99740 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 12 |
| 50% (the "average" last frost) | May 25 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 6 |
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 12 |
| 50% (the "average" first frost) | Aug 26 |
| 90% (late: most years have frozen by now) | Sep 7 |
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 25 | Aug 26 |
| 28°F (hard freeze) | May 14 | Sep 5 |
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 99740
Dates count from your average last spring frost (May 25) and first fall frost (Aug 26). 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 30–Apr 13 | Jun 1–15 (transplant) | – |
| Pepper (sweet and hot) | Mar 16–30 | Jun 8–22 (transplant) | – |
| Eggplant | Mar 16–30 | Jun 8–22 (transplant) | – |
| Tomatillo | Mar 30–Apr 13 | Jun 1–15 (transplant) | – |
| Lettuce | Mar 30–Apr 13 | May 4–25 (transplant) Apr 27–Jun 8 (sow outdoors) | Jul 1–22 (transplant) Jun 17–Jul 15 (sowing) |
| Spinach | – | Apr 13–May 4 (sow outdoors) | Jul 1–22 (sowing) |
| Kale | Mar 30–Apr 13 | Apr 27–May 11 (transplant) Apr 27–May 11 (sow outdoors) | Jun 3–Jul 1 (transplant) May 20–Jun 17 (sowing) |
| Collards | Mar 30–Apr 13 | Apr 27–May 25 (transplant) Apr 27–May 25 (sow outdoors) | Jun 3–Jul 1 (transplant) |
| Broccoli | Mar 16–30 | Apr 27–May 11 (transplant) | May 20–Jun 17 (transplant) |
| Cabbage | Mar 16–30 | Apr 27–May 11 (transplant) | May 20–Jun 17 (transplant) |
| Cauliflower | Mar 16–30 | May 11–25 (transplant) | – |
| Brussels sprouts | Mar 2–16 | Apr 27–May 11 (transplant) | – |
| Kohlrabi | Mar 30–Apr 13 | Apr 27–May 11 (transplant) Apr 27–May 11 (sow outdoors) | Jun 17–Jul 1 (sowing) |
| Bok choy / Asian greens | – | Apr 27–May 11 (sow outdoors) | Jul 1–15 (sowing) |
| Arugula | – | Apr 27–May 25 (sow outdoors) | Jul 1–29 (sowing) |
| Mustard greens | – | Apr 27–May 18 (sow outdoors) | Jul 1–15 (sowing) |
| Swiss chard | Apr 13–27 | May 11–Jun 1 (transplant) May 11–Jun 8 (sow outdoors) | Jun 17–Jul 1 (sowing) |
| Beet | – | Apr 27–May 25 (sow outdoors) | Jun 17–Jul 1 (sowing) |
| Carrot | – | May 4–Jun 1 (sow outdoors) | Jun 3–17 (sowing) |
| Radish | – | Apr 20–Jun 1 (sow outdoors) | Jul 15–29 (sowing) |
| Turnip | – | Apr 27–May 18 (sow outdoors) | Jun 17–Jul 1 (sowing) |
| Parsnip | – | May 4–25 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 30–Apr 27 (sow outdoors) | Jun 3–17 (sowing) |
| Onion (bulbing) | Mar 2–16 | Apr 13–27 (transplant) | – |
| Green onion / scallion | – | Apr 13–May 11 (sow outdoors) | Jun 17–Jul 1 (sowing) |
| Leek | Mar 2–16 | Apr 27–May 11 (transplant) | – |
| Garlic | – | – | Jul 15–Aug 12 (sowing) |
| Shallot | – | Apr 13–27 (transplant) | Jul 15–Aug 12 (sowing) |
| Potato | – | Apr 27–May 11 (transplant) | – |
| Sweet potato | – | Jun 15–29 (transplant) | – |
| Sweet corn | – | Jun 1–15 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 1–15 (sow outdoors) | – |
| Bean, pole | – | Jun 1–15 (sow outdoors) | – |
| Lima bean | – | Jun 8–22 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 15–Jul 6 (sow outdoors) | – |
| Cucumber | Apr 27–May 4 | Jun 1–15 (transplant) Jun 1–15 (sow outdoors) | – |
| Summer squash / zucchini | Apr 27–May 4 | Jun 1–15 (transplant) Jun 1–15 (sow outdoors) | – |
| Winter squash | Apr 27–May 4 | Jun 1–15 (transplant) Jun 1–15 (sow outdoors) | – |
| Pumpkin | – | Jun 1–15 (sow outdoors) | – |
| Watermelon | Apr 27–May 4 | Jun 8–22 (transplant) Jun 8–22 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 27–May 4 | Jun 8–22 (transplant) Jun 8–22 (sow outdoors) | – |
| Okra | Apr 13–27 | Jun 8–22 (transplant) Jun 8–22 (sow outdoors) | – |
| Celery | Mar 2–16 | Jun 1–8 (transplant) | – |
| Basil | Apr 13–27 | Jun 1–15 (transplant) Jun 1–15 (sow outdoors) | – |
| Cilantro | – | May 11–Jun 8 (sow outdoors) | Jul 1–15 (sowing) |
| Parsley | Mar 16–30 | May 11–25 (transplant) May 4–25 (sow outdoors) | – |
| Dill | – | May 25–Jun 8 (sow outdoors) | Jul 1–15 (sowing) |
| Sunflower | – | May 25–Jun 8 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 27–May 11 (transplant) | – |
| Rhubarb (crowns) | – | Apr 27–May 11 (transplant) | – |
| Strawberry (plants) | – | Apr 27–May 11 (transplant) | Jun 17–Jul 15 (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: Central #2, AK (NOAA GHCN-Daily ID USC00501466), elevation 920 ft, 143.0 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 99740
When is the last frost in 99740?
The average (50% chance) last spring freeze of 32°F for ZIP 99740 is May 25. For a more cautious planting date, use June 6, when only 1 year in 10 still sees a later freeze.
When is the first frost in 99740?
The average first fall freeze is August 26. In 1 year in 10 it comes by August 12.
What hardiness zone is 99740?
ZIP 99740 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 99740 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
99781 Venetie 99722 Arctic Village 99788 Chalkyitsik 99724 Beaver 99733 Circle 99701 Wiseman 99730 Central 99774 Stevens Village
Other ZIP codes in Yukon-Koyukuk Census Area
99558 99590 99602 99627 99665 99675 99691 99701 99720 99722 99724 99726 99730 99733 99741 99745 99746 99748 99754 99756 99757 99758 99760 99765 All Yukon-Koyukuk Census Area frost dates · Alaska frost dates
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