Frost Dates for Newberg, OR
In Newberg, OR, the average last spring frost is around Mar 21 and the average first fall frost around Nov 22, for a growing season of about 241 days. For frost-tender plants, wait until Apr 19, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Rex 1 S, OR weather station, 2 miles away, elevation 515 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% | Apr 19 | Nov 4 |
| 20% | Apr 10 | Nov 9 |
| 30% | Apr 2 | Nov 12 |
| 40% | Mar 28 | Nov 17 |
| 50% | Mar 21 | Nov 22 |
| 60% | Mar 15 | Nov 25 |
| 70% | Mar 9 | Nov 29 |
| 80% | Mar 1 | Dec 4 |
| 90% | Feb 23 | Dec 12 |
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) | Apr 21 | Nov 3 |
| Frost / freeze (32°F) | Mar 21 | Nov 22 |
| Hard freeze (28°F) | Feb 15 | Dec 10 |
Planting calendar for Newberg
Transplant Mar 28 – Apr 11
Transplant Apr 4 – Apr 18
Transplant Apr 4 – Apr 18
Transplant Mar 28 – Apr 11
Sow or transplant Mar 28 – Apr 11
Sow or transplant Mar 28 – Apr 11
Sow or transplant Apr 4 – Apr 18
Sow or transplant Feb 21 – Mar 7
Fall sowing Sep 27 – Oct 25
Fall sowing Sep 27 – Oct 18
Fall sowing Sep 13 – Sep 27
Sow or transplant Feb 21 – Mar 7
Fall sowing Sep 13 – Oct 11
Transplant Mar 7 – Mar 21
Fall sowing Aug 30 – Sep 13
Transplant Feb 28 – Mar 14
Fall sowing Aug 30 – Sep 13
Fall sowing Aug 30 – Sep 13
Fall sowing Oct 11 – Nov 1
Fall sowing Sep 13 – Sep 27
Plant Feb 21 – Mar 7
Based on the average last frost (Mar 21) and first frost (Nov 22). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.