Frost dates for ZIP 59746 (Maverick Mountain, 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, Dillon U Of Montana Western, MT (24 miles away).
- Average last spring frostJun 550% chance of a 32°F freeze after this date
- Average first fall frostSep 1350% chance of a 32°F freeze by this date
- Growing season (frost-free)98 daysmedian, 32°F threshold
- USDA hardiness zone5a-20 to -15°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
39°F Below 50°F
24-hour average · latest 43°F, as of Oct 17, 9:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Dillon 18 WSW (16 mi).
4-inch depth
39°F Below 50°F
24-hour average · latest 42°F, as of Oct 17, 9:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Dillon 18 WSW (16 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 59746 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 39°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 18 |
| 50% (the "average" last frost) | Jun 5 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 23 |
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 29 |
| 50% (the "average" first frost) | Sep 13 |
| 90% (late: most years have frozen by now) | Sep 27 |
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) | Jun 5 | Sep 13 |
| 28°F (hard freeze) | May 16 | Sep 25 |
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 59746
Dates count from your average last spring frost (Jun 5) and first fall frost (Sep 13). 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 10–24 | Jun 12–26 (transplant) | – |
| Pepper (sweet and hot) | Mar 27–Apr 10 | Jun 19–Jul 3 (transplant) | – |
| Eggplant | Mar 27–Apr 10 | Jun 19–Jul 3 (transplant) | – |
| Tomatillo | Apr 10–24 | Jun 12–26 (transplant) | – |
| Lettuce | Apr 10–24 | May 15–Jun 5 (transplant) May 8–Jun 19 (sow outdoors) | Jul 19–Aug 9 (transplant) Jul 5–Aug 2 (sowing) |
| Spinach | – | Apr 24–May 15 (sow outdoors) | Jul 19–Aug 9 (sowing) |
| Kale | Apr 10–24 | May 8–22 (transplant) May 8–22 (sow outdoors) | Jun 21–Jul 19 (transplant) Jun 7–Jul 5 (sowing) |
| Collards | Apr 10–24 | May 8–Jun 5 (transplant) May 8–Jun 5 (sow outdoors) | Jun 21–Jul 19 (transplant) Jun 7–Jul 5 (sowing) |
| Broccoli | Mar 27–Apr 10 | May 8–22 (transplant) | Jun 7–Jul 5 (transplant) |
| Cabbage | Mar 27–Apr 10 | May 8–22 (transplant) | Jun 7–Jul 5 (transplant) |
| Cauliflower | Mar 27–Apr 10 | May 22–Jun 5 (transplant) | Jun 7–Jul 5 (transplant) |
| Brussels sprouts | Mar 13–27 | May 8–22 (transplant) | May 24–Jun 14 (transplant) |
| Kohlrabi | Apr 10–24 | May 8–22 (transplant) May 8–22 (sow outdoors) | Jul 5–19 (sowing) |
| Bok choy / Asian greens | – | May 8–22 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Arugula | – | May 8–Jun 5 (sow outdoors) | Jul 19–Aug 16 (sowing) |
| Mustard greens | – | May 8–29 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Swiss chard | Apr 24–May 8 | May 22–Jun 12 (transplant) May 22–Jun 19 (sow outdoors) | Jul 5–19 (sowing) |
| Beet | – | May 8–Jun 5 (sow outdoors) | Jul 5–19 (sowing) |
| Carrot | – | May 15–Jun 12 (sow outdoors) | Jun 21–Jul 5 (sowing) |
| Radish | – | May 1–Jun 12 (sow outdoors) | Aug 2–16 (sowing) |
| Turnip | – | May 8–29 (sow outdoors) | Jul 5–19 (sowing) |
| Parsnip | – | May 15–Jun 5 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 10–May 8 (sow outdoors) | Jun 21–Jul 5 (sowing) |
| Onion (bulbing) | Mar 13–27 | Apr 24–May 8 (transplant) | – |
| Green onion / scallion | – | Apr 24–May 22 (sow outdoors) | Jul 5–19 (sowing) |
| Leek | Mar 13–27 | May 8–22 (transplant) | – |
| Garlic | – | – | Aug 2–30 (sowing) |
| Shallot | – | Apr 24–May 8 (transplant) | Aug 2–30 (sowing) |
| Potato | – | May 8–22 (transplant) | May 24–Jun 7 (transplant) |
| Sweet potato | – | Jun 26–Jul 10 (transplant) | – |
| Sweet corn | – | Jun 12–26 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 12–26 (sow outdoors) | – |
| Bean, pole | – | Jun 12–26 (sow outdoors) | – |
| Lima bean | – | Jun 19–Jul 3 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 26–Jul 17 (sow outdoors) | – |
| Cucumber | May 8–15 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Summer squash / zucchini | May 8–15 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Winter squash | May 8–15 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Pumpkin | – | Jun 12–26 (sow outdoors) | – |
| Watermelon | May 8–15 | Jun 19–Jul 3 (transplant) Jun 19–Jul 3 (sow outdoors) | – |
| Cantaloupe / muskmelon | May 8–15 | Jun 19–Jul 3 (transplant) Jun 19–Jul 3 (sow outdoors) | – |
| Okra | Apr 24–May 8 | Jun 19–Jul 3 (transplant) Jun 19–Jul 3 (sow outdoors) | – |
| Celery | Mar 13–27 | Jun 12–19 (transplant) | – |
| Basil | Apr 24–May 8 | Jun 12–26 (transplant) Jun 12–26 (sow outdoors) | – |
| Cilantro | – | May 22–Jun 19 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Parsley | Mar 27–Apr 10 | May 22–Jun 5 (transplant) May 15–Jun 5 (sow outdoors) | – |
| Dill | – | Jun 5–19 (sow outdoors) | Jul 19–Aug 2 (sowing) |
| Sunflower | – | Jun 5–19 (sow outdoors) | – |
| Asparagus (crowns) | – | May 8–22 (transplant) | – |
| Rhubarb (crowns) | – | May 8–22 (transplant) | – |
| Strawberry (plants) | – | May 8–22 (transplant) | Jul 5–Aug 2 (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: Dillon U Of Montana Western, MT (NOAA GHCN-Daily ID USC00242409), elevation 5,129 ft, 23.8 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Dillon AP, MT | 26 mi | Jun 2 | Sep 13 |
| Divide, MT | 29 mi | Jun 10 | Sep 7 |
| Twin Bridges, MT | 37 mi | Jun 8 | Sep 2 |
The average last-frost dates of these stations span 8 days, a rough guide to local variation. See data sources & methods.
Frost questions for 59746
When is the last frost in 59746?
The average (50% chance) last spring freeze of 32°F for ZIP 59746 is June 5. For a more cautious planting date, use June 23, when only 1 year in 10 still sees a later freeze.
When is the first frost in 59746?
The average first fall freeze is September 13. In 1 year in 10 it comes by August 29.
What hardiness zone is 59746?
ZIP 59746 is in USDA zone 5a (-20 to -15°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 59746 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
59736 Jackson 59732 Glen 59743 Butte-Silver Bow (balance) 59725 Dillon 59761 Wisdom 59727 Butte-Silver Bow (balance) 59754 Twin Bridges 83462
Other ZIP codes in Beaverhead County
59724 59725 59732 59736 59739 59743 59761 All Beaverhead County frost dates · Montana frost dates
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