Fall in zone 4bPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 59032 (Ayers Ranch Colony, MT)
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, Grass Range, MT (5 miles away).
- Average last spring frostMay 2050% chance of a 32°F freeze after this date
- Average first fall frostSep 2450% chance of a 32°F freeze by this date
- Growing season (frost-free)126 daysmedian, 32°F threshold
- USDA hardiness zone4b-25 to -20°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
44°F Below 50°F
24-hour average · latest 44°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Moccasin (59 mi).
4-inch depth
44°F Below 50°F
24-hour average · latest 45°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Moccasin (59 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 59032 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 44°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 mid-May).
Fertilizer window
Lawn region: Mountain West and High Plains. 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 6 |
| 50% (the "average" last frost) | May 20 |
| 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) | Sep 11 |
| 50% (the "average" first frost) | Sep 24 |
| 90% (late: most years have frozen by now) | Oct 5 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Jun 4 | Sep 13 |
| 32°F (freeze) | May 20 | Sep 24 |
| 28°F (hard freeze) | May 6 | Oct 2 |
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 59032
Dates count from your average last spring frost (May 20) and first fall frost (Sep 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 | Mar 25–Apr 8 | May 27–Jun 10 (transplant) | – |
| Pepper (sweet and hot) | Mar 11–25 | Jun 3–17 (transplant) | – |
| Eggplant | Mar 11–25 | Jun 3–17 (transplant) | – |
| Tomatillo | Mar 25–Apr 8 | May 27–Jun 10 (transplant) | – |
| Lettuce | Mar 25–Apr 8 | Apr 29–May 20 (transplant) Apr 22–Jun 3 (sow outdoors) | Jul 30–Aug 20 (transplant) Jul 16–Aug 13 (sowing) |
| Spinach | – | Apr 8–29 (sow outdoors) | Jul 30–Aug 20 (sowing) |
| Kale | Mar 25–Apr 8 | Apr 22–May 6 (transplant) Apr 22–May 6 (sow outdoors) | Jul 2–30 (transplant) Jun 18–Jul 16 (sowing) |
| Collards | Mar 25–Apr 8 | Apr 22–May 20 (transplant) Apr 22–May 20 (sow outdoors) | Jul 2–30 (transplant) Jun 18–Jul 16 (sowing) |
| Broccoli | Mar 11–25 | Apr 22–May 6 (transplant) | Jun 18–Jul 16 (transplant) |
| Cabbage | Mar 11–25 | Apr 22–May 6 (transplant) | Jun 18–Jul 16 (transplant) |
| Cauliflower | Mar 11–25 | May 6–20 (transplant) | Jun 18–Jul 16 (transplant) |
| Brussels sprouts | Feb 25–Mar 11 | Apr 22–May 6 (transplant) | Jun 4–25 (transplant) |
| Kohlrabi | Mar 25–Apr 8 | Apr 22–May 6 (transplant) Apr 22–May 6 (sow outdoors) | Jul 16–30 (sowing) |
| Bok choy / Asian greens | – | Apr 22–May 6 (sow outdoors) | Jul 30–Aug 13 (sowing) |
| Arugula | – | Apr 22–May 20 (sow outdoors) | Jul 30–Aug 27 (sowing) |
| Mustard greens | – | Apr 22–May 13 (sow outdoors) | Jul 30–Aug 13 (sowing) |
| Swiss chard | Apr 8–22 | May 6–27 (transplant) May 6–Jun 3 (sow outdoors) | Jul 16–30 (sowing) |
| Beet | – | Apr 22–May 20 (sow outdoors) | Jul 16–30 (sowing) |
| Carrot | – | Apr 29–May 27 (sow outdoors) | Jul 2–16 (sowing) |
| Radish | – | Apr 15–May 27 (sow outdoors) | Aug 13–27 (sowing) |
| Turnip | – | Apr 22–May 13 (sow outdoors) | Jul 16–30 (sowing) |
| Parsnip | – | Apr 29–May 20 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 25–Apr 22 (sow outdoors) | Jul 2–16 (sowing) |
| Onion (bulbing) | Feb 25–Mar 11 | Apr 8–22 (transplant) | – |
| Green onion / scallion | – | Apr 8–May 6 (sow outdoors) | Jul 16–30 (sowing) |
| Leek | Feb 25–Mar 11 | Apr 22–May 6 (transplant) | – |
| Garlic | – | – | Aug 13–Sep 10 (sowing) |
| Shallot | – | Apr 8–22 (transplant) | Aug 13–Sep 10 (sowing) |
| Potato | – | Apr 22–May 6 (transplant) | Jun 4–18 (transplant) |
| Sweet potato | – | Jun 10–24 (transplant) | – |
| Sweet corn | – | May 27–Jun 10 (sow outdoors) | – |
| Bean, bush (snap) | – | May 27–Jun 10 (sow outdoors) | – |
| Bean, pole | – | May 27–Jun 10 (sow outdoors) | – |
| Lima bean | – | Jun 3–17 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 10–Jul 1 (sow outdoors) | – |
| Cucumber | Apr 22–29 | May 27–Jun 10 (transplant) May 27–Jun 10 (sow outdoors) | – |
| Summer squash / zucchini | Apr 22–29 | May 27–Jun 10 (transplant) May 27–Jun 10 (sow outdoors) | – |
| Winter squash | Apr 22–29 | May 27–Jun 10 (transplant) May 27–Jun 10 (sow outdoors) | – |
| Pumpkin | – | May 27–Jun 10 (sow outdoors) | – |
| Watermelon | Apr 22–29 | Jun 3–17 (transplant) Jun 3–17 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 22–29 | Jun 3–17 (transplant) Jun 3–17 (sow outdoors) | – |
| Okra | Apr 8–22 | Jun 3–17 (transplant) Jun 3–17 (sow outdoors) | – |
| Celery | Feb 25–Mar 11 | May 27–Jun 3 (transplant) | – |
| Basil | Apr 8–22 | May 27–Jun 10 (transplant) May 27–Jun 10 (sow outdoors) | – |
| Cilantro | – | May 6–Jun 3 (sow outdoors) | Jul 30–Aug 13 (sowing) |
| Parsley | Mar 11–25 | May 6–20 (transplant) Apr 29–May 20 (sow outdoors) | – |
| Dill | – | May 20–Jun 3 (sow outdoors) | Jul 30–Aug 13 (sowing) |
| Sunflower | – | May 20–Jun 3 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 22–May 6 (transplant) | – |
| Rhubarb (crowns) | – | Apr 22–May 6 (transplant) | – |
| Strawberry (plants) | – | Apr 22–May 6 (transplant) | Jul 16–Aug 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: Grass Range, MT (NOAA GHCN-Daily ID USC00243727), elevation 3,490 ft, 4.7 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Flatwillow 4 ENE, MT | 21 mi | May 16 | Sep 28 |
| Valentine, MT | 24 mi | May 18 | Sep 21 |
| Lewistown 11ESE, MT | 25 mi | May 19 | Sep 25 |
The average last-frost dates of these stations span 4 days, a rough guide to local variation. See data sources & methods.
Frost questions for 59032
When is the last frost in 59032?
The average (50% chance) last spring freeze of 32°F for ZIP 59032 is May 20. 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 59032?
The average first fall freeze is September 24. In 1 year in 10 it comes by September 11.
What hardiness zone is 59032?
ZIP 59032 is in USDA zone 4b (-25 to -20°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 59032 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
59441 59087 Winnett 59471 Roy 59457 Lewistown 59072 Klein 59451 Hilger 59058 59464 Moore
Other ZIP codes in Fergus County
59424 59430 59441 59451 59457 59464 59471 59489 All Fergus County frost dates · Montana frost dates
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Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
- Freeze alerts
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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.