Frost dates for 97103Astoria, OR
The average last spring frost in Astoria is March 30 and the average first fall frost is November 18, giving a typical growing season of about 233 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 30
- Average first fall frost
- Nov 18
- Growing season
- 233 days
Safer after Apr 28 (1-in-10 risk)
Possible by Oct 27 (1-in-10 risk)
First frost typically in 19 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Apr 11 · Apr 30 · May 31 | Oct 6 · Oct 25 · Nov 13 | 177 days | 100% |
| Frost / freeze (32°F) | Feb 26 · Mar 30 · Apr 28 | Oct 27 · Nov 18 · Dec 16 | 233 days | 100% |
| Hard freeze (28°F) | Dec 19 · Feb 12 · Mar 9 | Nov 13 · Dec 13 · Feb 4 | 312 days | 92% |
Planting calendar for Astoria
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Feb 27 – May 5 |
| Tomatoes | Transplant outdoors | Apr 15 – Jul 29 |
| Peppers | Start seeds indoors | Feb 27 – Mar 30 |
| Peppers | Transplant outdoors | Apr 29 – May 30 |
| Eggplant | Start seeds indoors | Mar 16 – Apr 14 |
| Eggplant | Transplant outdoors | Apr 29 – May 30 |
| Cucumbers | Sow outdoors | Apr 29 – Aug 8 |
| Summer squash | Sow outdoors | Apr 15 – May 30 |
| Winter squash & pumpkins | Sow outdoors | Apr 29 – May 30 |
| Snap beans | Sow outdoors | Apr 15 – Aug 31 |
| Sweet corn | Sow outdoors | Apr 15 – Jul 29 |
| Watermelon & cantaloupe | Sow outdoors | Apr 29 – May 30 |
| Okra | Sow outdoors | Apr 22 – May 15 |
| Peas | Sow outdoors (spring) | Feb 27 – Apr 14 |
| Potatoes | Plant outdoors (spring) | Feb 27 – Apr 29 |
| Onions | Start seeds indoors (spring) | Jan 16 – Feb 12 |
| Onions | Transplant outdoors (spring) | Mar 16 – Apr 14 |
| Broccoli | Start seeds indoors (spring) | Feb 9 – Mar 15 |
| Broccoli | Transplant outdoors (spring) | Mar 16 – Apr 14 |
| Broccoli | Start seeds indoors (fall) | Jul 19 – Jul 29 |
| Broccoli | Transplant outdoors (fall) | Aug 18 – Aug 29 |
| Cabbage | Start seeds indoors (spring) | Jan 30 – Feb 27 |
| Cabbage | Transplant outdoors (spring) | Feb 27 – Mar 30 |
| Cabbage | Start seeds indoors (fall) | Jul 9 – Aug 8 |
| Cabbage | Transplant outdoors (fall) | Aug 8 – Sep 8 |
| Leaf lettuce | Sow outdoors (spring) | Feb 27 – May 15 |
| Leaf lettuce | Sow outdoors (fall) | Aug 8 – Sep 24 |
| Spinach | Sow outdoors (spring) | Feb 20 – Apr 5 |
| Spinach | Sow outdoors (fall) | Aug 25 – Sep 29 |
| Radishes | Sow outdoors (spring) | Feb 27 – Apr 19 |
| Radishes | Sow outdoors (fall) | Aug 8 – Oct 9 |
| Kale | Sow outdoors (spring) | Mar 16 – Apr 5 |
| Kale | Sow outdoors (fall) | Aug 1 – Sep 8 |
| Carrots | Sow outdoors (spring) | Mar 30 – May 15 |
| Carrots | Sow outdoors (fall) | Jul 9 – Aug 24 |
| Garlic | Plant outdoors (fall) | Nov 8 – Dec 9 |
Where these dates come from
ZIP code 97103 is matched to the NOAA station Ft Clatsop Natl Mem, OR, 6.6 km away, at 42 ft elevation (50 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Ft Clatsop Natl Mem, OR (used) | 42 ft | Mar 30 | Nov 18 |
| Astoria Rgnl Ap, OR | 9 ft | Mar 26 | Nov 11 |
| Seaside, OR | 10 ft | Apr 2 | Nov 12 |
| Naselle 2 Ene, WA | 50 ft | Apr 24 | Oct 20 |
Frost dates near Astoria
- Warrenton, OR 97146 · last Mar 26, first Nov 11
- Hammond, OR 97121 · last Mar 26, first Nov 11
- Chinook, WA 98614 · last Apr 6, first Oct 26
- Rosburg, WA 98643 · last Apr 27, first Oct 22
- Seaside, OR 97138 · last Apr 2, first Nov 12
- Naselle, WA 98638 · last Apr 6, first Oct 26
- Ilwaco, WA 98624 · last Apr 6, first Oct 26
- Seaview, WA 98644 · last Apr 6, first Oct 26
Frequently asked questions
- When is the last frost in Astoria, OR?
- For ZIP code 97103, the average last spring frost (32°F) is March 30, based on NOAA 1991-2020 climate normals for the Ft Clatsop Natl Mem, OR weather station. There is a 1-in-10 chance of a frost after April 28.
- When is the first frost in Astoria, OR?
- The average first fall frost (32°F) is November 18. There is a 1-in-10 chance of frost by October 27, so tender plants are at risk from that point on.
- How long is the growing season in 97103?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 233 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.