Frost Dates for Eagle, ID
In Eagle, ID, the average last spring frost is around Apr 30 and the average first fall frost around Oct 17, for a growing season of about 168 days. For frost-tender plants, wait until May 17, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Emmett 2 E, ID weather station, 6 miles away, elevation 2,390 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% | May 17 | Oct 2 |
| 20% | May 11 | Oct 7 |
| 30% | May 7 | Oct 11 |
| 40% | May 3 | Oct 14 |
| 50% | Apr 30 | Oct 17 |
| 60% | Apr 29 | Oct 19 |
| 70% | Apr 26 | Oct 22 |
| 80% | Apr 22 | Oct 25 |
| 90% | Apr 17 | Nov 1 |
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) | May 16 | Oct 4 |
| Frost / freeze (32°F) | Apr 30 | Oct 17 |
| Hard freeze (28°F) | Apr 14 | Oct 28 |
Planting calendar for Eagle
Transplant May 7 – May 21
Transplant May 14 – May 28
Transplant May 14 – May 28
Transplant May 7 – May 21
Sow or transplant May 7 – May 21
Sow or transplant May 7 – May 21
Sow or transplant May 14 – May 28
Sow or transplant Apr 2 – Apr 16
Fall sowing Aug 22 – Sep 19
Fall sowing Aug 22 – Sep 12
Fall sowing Aug 8 – Aug 22
Sow or transplant Apr 2 – Apr 16
Fall sowing Aug 8 – Sep 5
Transplant Apr 16 – Apr 30
Fall sowing Jul 25 – Aug 8
Transplant Apr 9 – Apr 23
Fall sowing Jul 25 – Aug 8
Fall sowing Jul 25 – Aug 8
Fall sowing Sep 5 – Sep 26
Fall sowing Aug 8 – Aug 22
Plant Apr 2 – Apr 16
Based on the average last frost (Apr 30) and first frost (Oct 17). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.