The current average 2-inch soil temperature across Wyoming is 66°F. Readings range from 60°F to 74°F, from 4 USDA and NOAA monitoring stations. Soil across Wyoming is running 3°F above the seasonal normal of 63°F for mid-September, based on 4 of 4 stations with historical records. Wyoming spans USDA hardiness zones 4b to 5b, cool-season grass country. Last updated September 14, 2026.
Soil across Wyoming is cooling off its summer peak at an average of 66°F at 2 inches. The fall poa annua pre-emergent window is in play as readings fall through the 65–70°F band, and cool-season overseeding follows close behind.
For cool-season lawns (fescue, bluegrass, ryegrass), fall is the best time to plant grass seed in Wyoming, with spring the second choice: fall seedlings face less weed competition and mature before summer heat. The window opens as 2-inch soil falls back through 70°F, and germination slows sharply once soil drops below 50°F, typically around October 12.
Spring is the second choice: the window opens when soil first holds 50°F and narrows as soil passes 65°F, typically by June 6.
| Region | Typical spring window opens | Typical fall window opens | Stations |
|---|---|---|---|
| Eastern Wyoming | May 16 | — | 2 |
| Central Wyoming | May 10 | August 30 | 2 |
Fall seeding also needs a stop date: new seedlings want about six weeks of growth before frost arrives. Your city page estimates the last safe seeding date from its nearest station: see when to plant in Cheyenne, when to plant in Casper or when to plant in Laramie. Readings current through September 14, 2026: Wyoming averages 66°F at 2 inches right now; the Current Planting Conditions section above reads that number against the season.
Typical dates are computed from historical 2-inch soil temperature averages at 4 monitoring stations in Wyoming; your own window depends on your nearest station's readings.
Historical 2-inch soil temperature normals for Wyoming: the median across 4 in-state stations with multi-year records. Any given year runs ahead of or behind these values; the live average at the top of this page shows where this year stands.
| Month | Average 2-inch soil temperature |
|---|---|
| January | 30°F |
| February | 32°F |
| March | 36°F |
| April | 45°F |
| May | 56°F |
| June | 69°F |
| July | 77°F |
| August | 74°F |
| September | 65°F |
| October | 49°F |
| November | 36°F |
| December | 31°F |
Shaded spring cells fall in the 50°F to 55°F pre-emergent window at 2-inch depth. The highlighted row is the current month.
Grass seed germination
Grass seed germination temperatures across Wyoming. Soil warmth varies by location, so check a city page for the live reading and what germinates there now.
| Grass species | Seeding soil temp (2 in) | Days |
|---|---|---|
| Kentucky bluegrass | 60–70°F | 14-30 |
| Tall fescue | 60–70°F | 7-12 |
| Perennial ryegrass | 60–70°F | 5-10 |
| Fine fescue | 60–70°F | 7-14 |
| Bermudagrass | 75–90°F | 10-30 |
For root-zone timing (fertilizer, aeration, weed control), see the 4-inch soil temperature for Wyoming. For accumulated-heat timing, see growing degree days for Wyoming. For how wet the ground is versus normal, see soil moisture for Wyoming. See the Wyoming soil temperature map for the full station view.
Interpolated from the latest 4-inch readings and refreshed daily.
| Station | 2" Temp | Last Reading |
|---|---|---|
| Torrington #1 (Goshen) | 74°F | 2026-09-14 |
| Moose 1 NNE | 61°F | 2026-09-14 |
| Lander 11 SSE | 69°F | 2026-09-14 |
| Sundance 8 NNW | 60°F | 2026-09-14 |
Current 2-inch readings grouped along Wyoming's east-to-west axis. Regional spread matters for timing: the warm end of the state can open an application window a week or more before the cool end.
| Region | Avg 2" Temp | Range | Stations |
|---|---|---|---|
| Eastern Wyoming (Goshen County) | 67°F | 60–74°F | 2 |
| Central Wyoming | 65°F | 61–69°F | 2 |
| City | ZIP | Current Temp |
|---|---|---|
| Casper | 82601 | 57°F* |
| Cheyenne | 82001 | 66°F |
| Evanston | 82930 | 60°F |
| Gillette | 82716 | 60°F |
| Jackson | 83001 | 61°F |
| Laramie | 82070 | 66°F |
| Rock Springs | 82901 | 69°F |
Modeled estimate where no monitoring station is within 99 miles; all other readings are measured at USDA and NOAA stations.
Fall is the best time to overseed a thin lawn.
Core aeration relieves compaction, but timing decides whether the lawn recovers in a week or struggles for a month.
Apply fall pre-emergent when 2-inch soil falls back through 70°F and keeps declining; that crossing is when poa annua and winter annual weeds sprout.
Check whether your soil is warm enough for the seed you bought: cool-season grass seeds into 50-65°F soil (tall fescue prefers 60°F and up), warm-season into 75-85°F.
The current average 2-inch soil temperature across Wyoming is 66°F. Readings range from 60°F to 74°F depending on location and elevation, from 4 USDA and NOAA monitoring stations. Soil across Wyoming is running 3°F above the seasonal normal of 63°F for mid-September, based on 4 of 4 stations with historical records.
Apply pre-emergent herbicide when soil at 2 inches reaches 55°F for several consecutive days. Timing varies across Wyoming, so check your city's page for station-specific readings and the pre-emergent timing recommendation.
Wyoming spans USDA hardiness zones 4b to 5b, cool-season grass country. For cool-season grasses (fescue, bluegrass), the fall window typically opens around August 30 and the spring window around May 10, based on historical 2-inch soil temperature averages at 4 in-state stations. Timing varies by location, so check your city's planting window for the dates specific to your area.