Frost Dates for Laramie, WY
In Laramie, WY, the average last spring frost is around Jun 7 and the average first fall frost around Sep 4, for a growing season of about 88 days. For frost-tender plants, wait until Jun 29, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Laramie 2 Nw, WY weather station, 2 miles away, elevation 7,140 ft. Frost can come earlier in low spots and valleys and later near cities and large lakes.
Frost probability by date
Chance of a 32°F frost after the spring date, or before the fall date.
| Chance | Last spring frost | First fall frost |
|---|---|---|
| 10% | Jun 29 | Aug 17 |
| 20% | Jun 19 | Aug 24 |
| 30% | Jun 15 | Aug 29 |
| 40% | Jun 11 | Sep 1 |
| 50% | Jun 7 | Sep 4 |
| 60% | Jun 4 | Sep 6 |
| 70% | Jun 1 | Sep 9 |
| 80% | May 28 | Sep 12 |
| 90% | May 23 | Sep 18 |
Light frost vs. hard freeze
Average (50%) dates for each temperature. Tender plants are damaged at 36°F; most hardy crops survive until 28°F.
| Temperature | Last in spring | First in fall |
|---|---|---|
| Light frost (36°F) | — | — |
| Frost / freeze (32°F) | Jun 7 | Sep 4 |
| Hard freeze (28°F) | May 22 | Sep 14 |
Planting calendar for Laramie
Transplant Jun 14 – Jun 28
Transplant Jun 21 – Jul 5
Transplant Jun 21 – Jul 5
Transplant Jun 14 – Jun 28
Sow or transplant Jun 14 – Jun 28
Sow or transplant Jun 14 – Jun 28
Sow or transplant Jun 21 – Jul 5
Sow or transplant May 10 – May 24
Fall sowing Jul 10 – Aug 7
Fall sowing Jul 10 – Jul 31
Fall sowing Jun 26 – Jul 10
Sow or transplant May 10 – May 24
Fall sowing Jun 26 – Jul 24
Transplant May 24 – Jun 7
Fall sowing Jun 12 – Jun 26
Transplant May 17 – May 31
Fall sowing Jun 12 – Jun 26
Fall sowing Jun 12 – Jun 26
Fall sowing Jul 24 – Aug 14
Fall sowing Jun 26 – Jul 10
Plant May 10 – May 24
Based on the average last frost (Jun 7) and first frost (Sep 4). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.