Fall in zone 4bPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 83121 (Lincoln County, WY)
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, La Barge, WY (34 miles away).
Station is a bit far
The nearest station with freeze normals is over 40 km away, so dates here may be off by a week or more.
- Average last spring frostJun 950% chance of a 32°F freeze after this date
- Average first fall frostSep 450% chance of a 32°F freeze by this date
- Growing season (frost-free)84 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
46°F Below 50°F
24-hour average · latest 46°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Buffalo Jump (48 mi), Chicken Ridge (53 mi).
4-inch depth
46°F Below 50°F
24-hour average · latest 46°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Buffalo Jump (48 mi), Chicken Ridge (53 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 83121 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 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 24 |
| 50% (the "average" last frost) | Jun 9 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 27 |
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 21 |
| 50% (the "average" first frost) | Sep 4 |
| 90% (late: most years have frozen by now) | Sep 18 |
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 9 | Sep 4 |
| 28°F (hard freeze) | May 24 | Sep 15 |
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 83121
Dates count from your average last spring frost (Jun 9) and first fall frost (Sep 4). 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 14–28 | Jun 16–30 (transplant) | – |
| Pepper (sweet and hot) | Mar 31–Apr 14 | Jun 23–Jul 7 (transplant) | – |
| Eggplant | Mar 31–Apr 14 | Jun 23–Jul 7 (transplant) | – |
| Tomatillo | Apr 14–28 | Jun 16–30 (transplant) | – |
| Lettuce | Apr 14–28 | May 19–Jun 9 (transplant) May 12–Jun 23 (sow outdoors) | Jul 10–31 (transplant) Jun 26–Jul 24 (sowing) |
| Spinach | – | Apr 28–May 19 (sow outdoors) | Jul 10–31 (sowing) |
| Kale | Apr 14–28 | May 12–26 (transplant) May 12–26 (sow outdoors) | Jun 12–Jul 10 (transplant) May 29–Jun 26 (sowing) |
| Collards | Apr 14–28 | May 12–Jun 9 (transplant) May 12–Jun 9 (sow outdoors) | Jun 12–Jul 10 (transplant) |
| Broccoli | Mar 31–Apr 14 | May 12–26 (transplant) | May 29–Jun 26 (transplant) |
| Cabbage | Mar 31–Apr 14 | May 12–26 (transplant) | May 29–Jun 26 (transplant) |
| Cauliflower | Mar 31–Apr 14 | May 26–Jun 9 (transplant) | – |
| Brussels sprouts | Mar 17–31 | May 12–26 (transplant) | – |
| Kohlrabi | Apr 14–28 | May 12–26 (transplant) May 12–26 (sow outdoors) | Jun 26–Jul 10 (sowing) |
| Bok choy / Asian greens | – | May 12–26 (sow outdoors) | Jul 10–24 (sowing) |
| Arugula | – | May 12–Jun 9 (sow outdoors) | Jul 10–Aug 7 (sowing) |
| Mustard greens | – | May 12–Jun 2 (sow outdoors) | Jul 10–24 (sowing) |
| Swiss chard | Apr 28–May 12 | May 26–Jun 16 (transplant) May 26–Jun 23 (sow outdoors) | Jun 26–Jul 10 (sowing) |
| Beet | – | May 12–Jun 9 (sow outdoors) | Jun 26–Jul 10 (sowing) |
| Carrot | – | May 19–Jun 16 (sow outdoors) | – |
| Radish | – | May 5–Jun 16 (sow outdoors) | Jul 24–Aug 7 (sowing) |
| Turnip | – | May 12–Jun 2 (sow outdoors) | Jun 26–Jul 10 (sowing) |
| Parsnip | – | May 19–Jun 9 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Apr 14–May 12 (sow outdoors) | Jun 12–26 (sowing) |
| Onion (bulbing) | Mar 17–31 | Apr 28–May 12 (transplant) | – |
| Green onion / scallion | – | Apr 28–May 26 (sow outdoors) | Jun 26–Jul 10 (sowing) |
| Leek | Mar 17–31 | May 12–26 (transplant) | – |
| Garlic | – | – | Jul 24–Aug 21 (sowing) |
| Shallot | – | Apr 28–May 12 (transplant) | Jul 24–Aug 21 (sowing) |
| Potato | – | May 12–26 (transplant) | – |
| Sweet potato | – | Jun 30–Jul 14 (transplant) | – |
| Sweet corn | – | Jun 16–30 (sow outdoors) | – |
| Bean, bush (snap) | – | Jun 16–30 (sow outdoors) | – |
| Bean, pole | – | Jun 16–30 (sow outdoors) | – |
| Lima bean | – | Jun 23–Jul 7 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 30–Jul 21 (sow outdoors) | – |
| Cucumber | May 12–19 | Jun 16–30 (transplant) Jun 16–30 (sow outdoors) | – |
| Summer squash / zucchini | May 12–19 | Jun 16–30 (transplant) Jun 16–30 (sow outdoors) | – |
| Winter squash | May 12–19 | Jun 16–30 (transplant) Jun 16–30 (sow outdoors) | – |
| Pumpkin | – | Jun 16–30 (sow outdoors) | – |
| Watermelon | May 12–19 | Jun 23–Jul 7 (transplant) Jun 23–Jul 7 (sow outdoors) | – |
| Cantaloupe / muskmelon | May 12–19 | Jun 23–Jul 7 (transplant) Jun 23–Jul 7 (sow outdoors) | – |
| Okra | Apr 28–May 12 | Jun 23–Jul 7 (transplant) Jun 23–Jul 7 (sow outdoors) | – |
| Celery | Mar 17–31 | Jun 16–23 (transplant) | – |
| Basil | Apr 28–May 12 | Jun 16–30 (transplant) Jun 16–30 (sow outdoors) | – |
| Cilantro | – | May 26–Jun 23 (sow outdoors) | Jul 10–24 (sowing) |
| Parsley | Mar 31–Apr 14 | May 26–Jun 9 (transplant) May 19–Jun 9 (sow outdoors) | – |
| Dill | – | Jun 9–23 (sow outdoors) | Jul 10–24 (sowing) |
| Sunflower | – | Jun 9–23 (sow outdoors) | – |
| Asparagus (crowns) | – | May 12–26 (transplant) | – |
| Rhubarb (crowns) | – | May 12–26 (transplant) | – |
| Strawberry (plants) | – | May 12–26 (transplant) | Jun 26–Jul 24 (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: La Barge, WY (NOAA GHCN-Daily ID USC00485252), elevation 6,598 ft, 33.7 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Randolph, UT | 36 mi | Jun 14 | Sep 1 |
| Church Buttes Gas Plt, WY | 39 mi | May 25 | Sep 27 |
| Laketown, UT | 40 mi | May 28 | Sep 24 |
The average last-frost dates of these stations span 20 days, a rough guide to local variation. See data sources & methods.
Frost questions for 83121
When is the last frost in 83121?
The average (50% chance) last spring freeze of 32°F for ZIP 83121 is June 9. For a more cautious planting date, use June 27, when only 1 year in 10 still sees a later freeze.
When is the first frost in 83121?
The average first fall freeze is September 4. In 1 year in 10 it comes by August 21.
What hardiness zone is 83121?
ZIP 83121 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 83121 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
83116 Kemmerer 83101 Kemmerer 83124 Opal 83114 Taylor 83123 La Barge 84064 Randolph 82934 Granger 84038 Garden
Other ZIP codes in Lincoln County
83101 83110 83111 83112 83114 83116 83118 83119 83122 83123 83124 83126 83127 83128 All Lincoln County frost dates · Wyoming frost dates
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- 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.