Frost dates for ZIP 58579 (Wilton, 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, Wilton, ND (3 miles away).
- Average last spring frostMay 1150% chance of a 32°F freeze after this date
- Average first fall frostSep 3050% chance of a 32°F freeze by this date
- Growing season (frost-free)142 daysmedian, 32°F threshold
- USDA hardiness zone4a-30 to -25°F avg. coldest night
Get The Dial for 58579 (Wilton)
Frost and freeze alerts from the NWS forecast for 58579, the spring soil-temperature heads-up for pre-emergent, and a short weekly yard-timing email.
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 17, 2026, from your frost dates, zone and soil temperature. Lawn timing · Vegetables · Pruning · Plants
Soil temperature now
2-inch depth
48°F Below 50°F
24-hour average · latest 51°F, as of Oct 17, 11:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Mandan #1 (29 mi).
4-inch depth
49°F Below 50°F
24-hour average · latest 51°F, as of Oct 17, 11:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Mandan #1 (29 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 58579 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 49°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) | Apr 30 |
| 50% (the "average" last frost) | May 11 |
| 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 17 |
| 50% (the "average" first frost) | Sep 30 |
| 90% (late: most years have frozen by now) | Oct 12 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 20 | Sep 22 |
| 32°F (freeze) | May 11 | Sep 30 |
| 28°F (hard freeze) | May 1 | Oct 9 |
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 58579
Dates count from your average last spring frost (May 11) and first fall frost (Sep 30). 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 16–30 | May 18–Jun 1 (transplant) | – |
| Pepper (sweet and hot) | Mar 2–16 | May 25–Jun 8 (transplant) | – |
| Eggplant | Mar 2–16 | May 25–Jun 8 (transplant) | – |
| Tomatillo | Mar 16–30 | May 18–Jun 1 (transplant) | – |
| Lettuce | Mar 16–30 | Apr 20–May 11 (transplant) Apr 13–May 25 (sow outdoors) | Aug 5–26 (transplant) Jul 22–Aug 19 (sowing) |
| Spinach | – | Mar 30–Apr 20 (sow outdoors) | Aug 5–26 (sowing) |
| Kale | Mar 16–30 | Apr 13–27 (transplant) Apr 13–27 (sow outdoors) | Jul 8–Aug 5 (transplant) Jun 24–Jul 22 (sowing) |
| Collards | Mar 16–30 | Apr 13–May 11 (transplant) Apr 13–May 11 (sow outdoors) | Jul 8–Aug 5 (transplant) Jun 24–Jul 22 (sowing) |
| Broccoli | Mar 2–16 | Apr 13–27 (transplant) | Jun 24–Jul 22 (transplant) |
| Cabbage | Mar 2–16 | Apr 13–27 (transplant) | Jun 24–Jul 22 (transplant) |
| Cauliflower | Mar 2–16 | Apr 27–May 11 (transplant) | Jun 24–Jul 22 (transplant) |
| Brussels sprouts | Feb 16–Mar 2 | Apr 13–27 (transplant) | Jun 10–Jul 1 (transplant) |
| Kohlrabi | Mar 16–30 | Apr 13–27 (transplant) Apr 13–27 (sow outdoors) | Jul 22–Aug 5 (sowing) |
| Bok choy / Asian greens | – | Apr 13–27 (sow outdoors) | Aug 5–19 (sowing) |
| Arugula | – | Apr 13–May 11 (sow outdoors) | Aug 5–Sep 2 (sowing) |
| Mustard greens | – | Apr 13–May 4 (sow outdoors) | Aug 5–19 (sowing) |
| Swiss chard | Mar 30–Apr 13 | Apr 27–May 18 (transplant) Apr 27–May 25 (sow outdoors) | Jul 22–Aug 5 (sowing) |
| Beet | – | Apr 13–May 11 (sow outdoors) | Jul 22–Aug 5 (sowing) |
| Carrot | – | Apr 20–May 18 (sow outdoors) | Jul 8–22 (sowing) |
| Radish | – | Apr 6–May 18 (sow outdoors) | Aug 19–Sep 2 (sowing) |
| Turnip | – | Apr 13–May 4 (sow outdoors) | Jul 22–Aug 5 (sowing) |
| Parsnip | – | Apr 20–May 11 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 16–Apr 13 (sow outdoors) | Jul 8–22 (sowing) |
| Onion (bulbing) | Feb 16–Mar 2 | Mar 30–Apr 13 (transplant) | – |
| Green onion / scallion | – | Mar 30–Apr 27 (sow outdoors) | Jul 22–Aug 5 (sowing) |
| Leek | Feb 16–Mar 2 | Apr 13–27 (transplant) | – |
| Garlic | – | – | Aug 19–Sep 16 (sowing) |
| Shallot | – | Mar 30–Apr 13 (transplant) | Aug 19–Sep 16 (sowing) |
| Potato | – | Apr 13–27 (transplant) | Jun 10–24 (transplant) |
| Sweet potato | – | Jun 1–15 (transplant) | – |
| Sweet corn | – | May 18–Jun 1 (sow outdoors) | – |
| Bean, bush (snap) | – | May 18–Jun 1 (sow outdoors) | – |
| Bean, pole | – | May 18–Jun 1 (sow outdoors) | – |
| Lima bean | – | May 25–Jun 8 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 1–22 (sow outdoors) | – |
| Cucumber | Apr 13–20 | May 18–Jun 1 (transplant) May 18–Jun 1 (sow outdoors) | – |
| Summer squash / zucchini | Apr 13–20 | May 18–Jun 1 (transplant) May 18–Jun 1 (sow outdoors) | – |
| Winter squash | Apr 13–20 | May 18–Jun 1 (transplant) May 18–Jun 1 (sow outdoors) | – |
| Pumpkin | – | May 18–Jun 1 (sow outdoors) | – |
| Watermelon | Apr 13–20 | May 25–Jun 8 (transplant) May 25–Jun 8 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 13–20 | May 25–Jun 8 (transplant) May 25–Jun 8 (sow outdoors) | – |
| Okra | Mar 30–Apr 13 | May 25–Jun 8 (transplant) May 25–Jun 8 (sow outdoors) | – |
| Celery | Feb 16–Mar 2 | May 18–25 (transplant) | – |
| Basil | Mar 30–Apr 13 | May 18–Jun 1 (transplant) May 18–Jun 1 (sow outdoors) | – |
| Cilantro | – | Apr 27–May 25 (sow outdoors) | Aug 5–19 (sowing) |
| Parsley | Mar 2–16 | Apr 27–May 11 (transplant) Apr 20–May 11 (sow outdoors) | – |
| Dill | – | May 11–25 (sow outdoors) | Aug 5–19 (sowing) |
| Sunflower | – | May 11–25 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 13–27 (transplant) | – |
| Rhubarb (crowns) | – | Apr 13–27 (transplant) | – |
| Strawberry (plants) | – | Apr 13–27 (transplant) | Jul 22–Aug 19 (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: Wilton, ND (NOAA GHCN-Daily ID USC00329455), elevation 2,188 ft, 2.7 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Washburn, ND | 16 mi | May 12 | Sep 30 |
| Center 4SE, ND | 24 mi | May 11 | Sep 29 |
| Bismarck 2.4 NNW, ND | 24 mi | May 10 | Sep 30 |
The average last-frost dates of these stations span 2 days, a rough guide to local variation. See data sources & methods.
Frost questions for 58579
When is the last frost in 58579?
The average (50% chance) last spring freeze of 32°F for ZIP 58579 is May 11. 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 58579?
The average first fall freeze is September 30. In 1 year in 10 it comes by September 17.
What hardiness zone is 58579?
ZIP 58579 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 58579 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
58477 Regan 58521 58577 Washburn 58503 Bismarck 58530 Center 58559 Mercer 58494 Wing 58505 Bismarck
Other ZIP codes in Burleigh County
58477 58494 58501 58503 58504 58505 58521 58532 58558 58560 58572 All Burleigh County frost dates · North Dakota frost dates
Never miss a frost: get The Dial
Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
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.