Fall in zone 5aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 59071 (Roscoe, 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, Mystic Lake, MT (5 miles away).
- Average last spring frostJun 550% chance of a 32°F freeze after this date
- Average first fall frostSep 1450% chance of a 32°F freeze by this date
- Growing season (frost-free)99 daysmedian, 32°F threshold
- USDA hardiness zone5a-20 to -15°F avg. coldest night
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Frost and freeze alerts from the NWS forecast for 59071, the spring soil-temperature heads-up for pre-emergent, and a short weekly yard-timing email.
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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
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 59071 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 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 22 |
| 50% (the "average" last frost) | Jun 5 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 21 |
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 31 |
| 50% (the "average" first frost) | Sep 14 |
| 90% (late: most years have frozen by now) | Sep 28 |
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 14 |
| 28°F (hard freeze) | May 24 | 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 59071
Dates count from your average last spring frost (Jun 5) and first fall frost (Sep 14). 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 20–Aug 10 (transplant) Jul 6–Aug 3 (sowing) |
| Spinach | – | Apr 24–May 15 (sow outdoors) | Jul 20–Aug 10 (sowing) |
| Kale | Apr 10–24 | May 8–22 (transplant) May 8–22 (sow outdoors) | Jun 22–Jul 20 (transplant) Jun 8–Jul 6 (sowing) |
| Collards | Apr 10–24 | May 8–Jun 5 (transplant) May 8–Jun 5 (sow outdoors) | Jun 22–Jul 20 (transplant) Jun 8–Jul 6 (sowing) |
| Broccoli | Mar 27–Apr 10 | May 8–22 (transplant) | Jun 8–Jul 6 (transplant) |
| Cabbage | Mar 27–Apr 10 | May 8–22 (transplant) | Jun 8–Jul 6 (transplant) |
| Cauliflower | Mar 27–Apr 10 | May 22–Jun 5 (transplant) | Jun 8–Jul 6 (transplant) |
| Brussels sprouts | Mar 13–27 | May 8–22 (transplant) | May 25–Jun 15 (transplant) |
| Kohlrabi | Apr 10–24 | May 8–22 (transplant) May 8–22 (sow outdoors) | Jul 6–20 (sowing) |
| Bok choy / Asian greens | – | May 8–22 (sow outdoors) | Jul 20–Aug 3 (sowing) |
| Arugula | – | May 8–Jun 5 (sow outdoors) | Jul 20–Aug 17 (sowing) |
| Mustard greens | – | May 8–29 (sow outdoors) | Jul 20–Aug 3 (sowing) |
| Swiss chard | Apr 24–May 8 | May 22–Jun 12 (transplant) May 22–Jun 19 (sow outdoors) | Jul 6–20 (sowing) |
| Beet | – | May 8–Jun 5 (sow outdoors) | Jul 6–20 (sowing) |
| Carrot | – | May 15–Jun 12 (sow outdoors) | Jun 22–Jul 6 (sowing) |
| Radish | – | May 1–Jun 12 (sow outdoors) | Aug 3–17 (sowing) |
| Turnip | – | May 8–29 (sow outdoors) | Jul 6–20 (sowing) |
| Parsnip | – | May 15–Jun 5 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 10–May 8 (sow outdoors) | Jun 22–Jul 6 (sowing) |
| Onion (bulbing) | Mar 13–27 | Apr 24–May 8 (transplant) | – |
| Green onion / scallion | – | Apr 24–May 22 (sow outdoors) | Jul 6–20 (sowing) |
| Leek | Mar 13–27 | May 8–22 (transplant) | – |
| Garlic | – | – | Aug 3–31 (sowing) |
| Shallot | – | Apr 24–May 8 (transplant) | Aug 3–31 (sowing) |
| Potato | – | May 8–22 (transplant) | May 25–Jun 8 (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 20–Aug 3 (sowing) |
| Parsley | Mar 27–Apr 10 | May 22–Jun 5 (transplant) May 15–Jun 5 (sow outdoors) | – |
| Dill | – | Jun 5–19 (sow outdoors) | Jul 20–Aug 3 (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 6–Aug 3 (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: Mystic Lake, MT (NOAA GHCN-Daily ID USC00245961), elevation 6,544 ft, 5.0 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Nye #2, MT | 16 mi | Jun 1 | Sep 11 |
| Red Lodge, MT | 19 mi | Jun 3 | Sep 19 |
| Clark 3NE, WY | 32 mi | May 18 | Sep 22 |
The average last-frost dates of these stations span 18 days, a rough guide to local variation. See data sources & methods.
Frost questions for 59071
When is the last frost in 59071?
The average (50% chance) last spring freeze of 32°F for ZIP 59071 is June 5. For a more cautious planting date, use June 21, when only 1 year in 10 still sees a later freeze.
When is the first frost in 59071?
The average first fall freeze is September 14. In 1 year in 10 it comes by August 31.
What hardiness zone is 59071?
ZIP 59071 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 59071 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
59028 Fishtail 59068 Red Lodge 59061 59001 Absarokee 59007 Bearcreek 59070 Roberts 59081 Silver Gate 59020 Cooke City
Other ZIP codes in Carbon County
59007 59008 59013 59014 59026 59029 59041 59068 59070 All Carbon 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
- Soil-temp heads-up
- Weekly yard to-dos
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.