Frost Dates for Eugene, OR
In Eugene, OR, the average last spring frost is around Apr 11 and the average first fall frost around Oct 23, for a growing season of about 196 days. For frost-tender plants, wait until May 9, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Eugene Mahlon Sweet Airport, OR weather station, 7 miles away, elevation 353 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 9 | Oct 6 |
| 20% | Apr 30 | Oct 11 |
| 30% | Apr 25 | Oct 15 |
| 40% | Apr 17 | Oct 19 |
| 50% | Apr 11 | Oct 23 |
| 60% | Apr 3 | Oct 27 |
| 70% | Mar 29 | Oct 31 |
| 80% | Mar 23 | Nov 5 |
| 90% | Mar 15 | Nov 13 |
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 15 | Oct 7 |
| Frost / freeze (32°F) | Apr 11 | Oct 23 |
| Hard freeze (28°F) | Mar 3 | Nov 11 |
Planting calendar for Eugene
Transplant Apr 18 – May 2
Transplant Apr 25 – May 9
Transplant Apr 25 – May 9
Transplant Apr 18 – May 2
Sow or transplant Apr 18 – May 2
Sow or transplant Apr 18 – May 2
Sow or transplant Apr 25 – May 9
Sow or transplant Mar 14 – Mar 28
Fall sowing Aug 28 – Sep 25
Fall sowing Aug 28 – Sep 18
Fall sowing Aug 14 – Aug 28
Sow or transplant Mar 14 – Mar 28
Fall sowing Aug 14 – Sep 11
Transplant Mar 28 – Apr 11
Fall sowing Jul 31 – Aug 14
Transplant Mar 21 – Apr 4
Fall sowing Jul 31 – Aug 14
Fall sowing Jul 31 – Aug 14
Fall sowing Sep 11 – Oct 2
Fall sowing Aug 14 – Aug 28
Plant Mar 14 – Mar 28
Based on the average last frost (Apr 11) and first frost (Oct 23). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.