Fall in zone 4aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 58801 (Williston, ND)
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, Williston EXP Farm, ND (7 miles away).
- Average last spring frostMay 1350% chance of a 32°F freeze after this date
- Average first fall frostSep 2650% chance of a 32°F freeze by this date
- Growing season (frost-free)135 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
46°F Below 50°F
24-hour average · latest 48°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Sidney (39 mi), Wolf Point 29 ENE (61 mi).
4-inch depth
46°F Below 50°F
24-hour average · latest 48°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Sidney (39 mi), Wolf Point 29 ENE (61 mi).
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 58801 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 46°F at 4 inches (estimated soil temperature, not a station reading). Fall pre-emergent window is mostly past. Next: spring, when soil reaches 50°F (typically 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 1 |
| 50% (the "average" last frost) | May 13 |
| 10% (cautious: only 1 year in 10 freezes later) | May 25 |
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) | Sep 14 |
| 50% (the "average" first frost) | Sep 26 |
| 90% (late: most years have frozen by now) | Oct 8 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 23 | Sep 19 |
| 32°F (freeze) | May 13 | Sep 26 |
| 28°F (hard freeze) | May 3 | Oct 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 58801
Dates count from your average last spring frost (May 13) and first fall frost (Sep 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 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) | Aug 1–22 (transplant) Jul 18–Aug 15 (sowing) |
| Spinach | – | Apr 1–22 (sow outdoors) | Aug 1–22 (sowing) |
| Kale | Mar 18–Apr 1 | Apr 15–29 (transplant) Apr 15–29 (sow outdoors) | Jul 4–Aug 1 (transplant) Jun 20–Jul 18 (sowing) |
| Collards | Mar 18–Apr 1 | Apr 15–May 13 (transplant) Apr 15–May 13 (sow outdoors) | Jul 4–Aug 1 (transplant) Jun 20–Jul 18 (sowing) |
| Broccoli | Mar 4–18 | Apr 15–29 (transplant) | Jun 20–Jul 18 (transplant) |
| Cabbage | Mar 4–18 | Apr 15–29 (transplant) | Jun 20–Jul 18 (transplant) |
| Cauliflower | Mar 4–18 | Apr 29–May 13 (transplant) | Jun 20–Jul 18 (transplant) |
| Brussels sprouts | Feb 18–Mar 4 | Apr 15–29 (transplant) | Jun 6–27 (transplant) |
| Kohlrabi | Mar 18–Apr 1 | Apr 15–29 (transplant) Apr 15–29 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Bok choy / Asian greens | – | Apr 15–29 (sow outdoors) | Aug 1–15 (sowing) |
| Arugula | – | Apr 15–May 13 (sow outdoors) | Aug 1–29 (sowing) |
| Mustard greens | – | Apr 15–May 6 (sow outdoors) | Aug 1–15 (sowing) |
| Swiss chard | Apr 1–15 | Apr 29–May 20 (transplant) Apr 29–May 27 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Beet | – | Apr 15–May 13 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Carrot | – | Apr 22–May 20 (sow outdoors) | Jul 4–18 (sowing) |
| Radish | – | Apr 8–May 20 (sow outdoors) | Aug 15–29 (sowing) |
| Turnip | – | Apr 15–May 6 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Parsnip | – | Apr 22–May 13 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 18–Apr 15 (sow outdoors) | Jul 4–18 (sowing) |
| Onion (bulbing) | Feb 18–Mar 4 | Apr 1–15 (transplant) | – |
| Green onion / scallion | – | Apr 1–29 (sow outdoors) | Jul 18–Aug 1 (sowing) |
| Leek | Feb 18–Mar 4 | Apr 15–29 (transplant) | – |
| Garlic | – | – | Aug 15–Sep 12 (sowing) |
| Shallot | – | Apr 1–15 (transplant) | Aug 15–Sep 12 (sowing) |
| Potato | – | Apr 15–29 (transplant) | Jun 6–20 (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) | Aug 1–15 (sowing) |
| Parsley | Mar 4–18 | Apr 29–May 13 (transplant) Apr 22–May 13 (sow outdoors) | – |
| Dill | – | May 13–27 (sow outdoors) | Aug 1–15 (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 18–Aug 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: Williston EXP Farm, ND (NOAA GHCN-Daily ID USC00329430), elevation 2,105 ft, 7.1 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Williston Sloulin Intl AP, ND | 8 mi | May 21 | Sep 21 |
| Culbertson, MT | 35 mi | May 21 | Sep 20 |
| Medicine Lake 3 SE, MT | 36 mi | May 16 | Sep 18 |
The average last-frost dates of these stations span 8 days, a rough guide to local variation. See data sources & methods.
Frost questions for 58801
When is the last frost in 58801?
The average (50% chance) last spring freeze of 32°F for ZIP 58801 is May 13. For a more cautious planting date, use May 25, when only 1 year in 10 still sees a later freeze.
When is the first frost in 58801?
The average first fall freeze is September 26. In 1 year in 10 it comes by September 14.
What hardiness zone is 58801?
ZIP 58801 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 58801 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
58853 Trenton 59212 Bainville 58843 Epping 58856 58831 Alexander 58849 Ray 58830 Alamo 58845 Grenora
Other ZIP codes in Williams County
58755 58830 58843 58845 58849 58852 58853 58856 All Williams County frost dates · North Dakota frost dates
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