Frost dates for 98283Rockport, WA
The average last spring frost in Rockport is April 16 and the average first fall frost is October 25, giving a typical growing season of about 192 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 16
- Average first fall frost
- Oct 25
- Growing season
- 192 days
Safer after May 6 (1-in-10 risk)
Possible by Oct 10 (1-in-10 risk)
Last frost typically in 170 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 19 · May 6 · May 21 | Sep 27 · Oct 10 · Oct 25 | 157 days | 100% |
| Frost / freeze (32°F) | Mar 26 · Apr 16 · May 6 | Oct 10 · Oct 25 · Nov 11 | 192 days | 100% |
| Hard freeze (28°F) | Feb 27 · Mar 19 · Apr 6 | Oct 22 · Nov 11 · Dec 6 | 237 days | 100% |
Planting calendar for Rockport
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 | Mar 16 – May 22 |
| Tomatoes | Transplant outdoors | May 2 – Jul 5 |
| Peppers | Start seeds indoors | Mar 16 – Apr 16 |
| Peppers | Transplant outdoors | May 16 – Jun 16 |
| Eggplant | Start seeds indoors | Apr 2 – May 1 |
| Eggplant | Transplant outdoors | May 16 – Jun 16 |
| Cucumbers | Sow outdoors | May 16 – Jul 15 |
| Summer squash | Sow outdoors | May 2 – Jun 16 |
| Winter squash & pumpkins | Sow outdoors | May 16 – Jun 16 |
| Snap beans | Sow outdoors | May 2 – Aug 7 |
| Sweet corn | Sow outdoors | May 2 – Jul 5 |
| Watermelon & cantaloupe | Sow outdoors | May 16 – Jun 16 |
| Okra | Sow outdoors | May 9 – Jun 1 |
| Peas | Sow outdoors (spring) | Mar 16 – May 1 |
| Potatoes | Plant outdoors (spring) | Mar 16 – May 16 |
| Onions | Start seeds indoors (spring) | Feb 2 – Mar 1 |
| Onions | Transplant outdoors (spring) | Apr 2 – May 1 |
| Broccoli | Start seeds indoors (spring) | Feb 26 – Apr 1 |
| Broccoli | Transplant outdoors (spring) | Apr 2 – May 1 |
| Broccoli | Start seeds indoors (fall) | Jun 25 – Jul 5 |
| Broccoli | Transplant outdoors (fall) | Jul 25 – Aug 5 |
| Cabbage | Start seeds indoors (spring) | Feb 16 – Mar 16 |
| Cabbage | Transplant outdoors (spring) | Mar 16 – Apr 16 |
| Cabbage | Start seeds indoors (fall) | Jun 15 – Jul 15 |
| Cabbage | Transplant outdoors (fall) | Jul 15 – Aug 15 |
| Leaf lettuce | Sow outdoors (spring) | Mar 16 – Jun 1 |
| Leaf lettuce | Sow outdoors (fall) | Jul 15 – Aug 31 |
| Spinach | Sow outdoors (spring) | Mar 9 – Apr 22 |
| Spinach | Sow outdoors (fall) | Aug 1 – Sep 5 |
| Radishes | Sow outdoors (spring) | Mar 16 – May 6 |
| Radishes | Sow outdoors (fall) | Jul 15 – Sep 15 |
| Kale | Sow outdoors (spring) | Apr 2 – Apr 22 |
| Kale | Sow outdoors (fall) | Jul 8 – Aug 15 |
| Carrots | Sow outdoors (spring) | Apr 16 – Jun 1 |
| Carrots | Sow outdoors (fall) | Jun 15 – Jul 31 |
| Garlic | Plant outdoors (fall) | Oct 15 – Nov 15 |
Where these dates come from
ZIP code 98283 is matched to the NOAA station Darrington 21 Nne, WA, 11.2 km away, at 407 ft elevation (155 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Darrington 21 Nne, WA (used) | 407 ft | Apr 16 | Oct 25 |
| Concrete Ppl Fish Stn, WA | 195 ft | Mar 28 | Nov 14 |
| Upper Baker Dam, WA | 690 ft | Apr 24 | Oct 29 |
| Darrington Rs, WA | 550 ft | Apr 16 | Oct 23 |
Frost dates near Rockport
- Concrete, WA 98237 · last Apr 24, first Oct 29
- Marblemount, WA 98267 · last Apr 8, first Nov 10
- Darrington, WA 98241 · last Apr 16, first Oct 23
- Hamilton, WA 98255 · last Mar 27, first Nov 6
- Lyman, WA 98263 · last Mar 27, first Nov 6
- Mount Vernon, WA 98274 · last Mar 27, first Nov 6
- Sedro Woolley, WA 98284 · last Mar 27, first Nov 6
- Clearlake, WA 98235 · last Mar 27, first Nov 6
Frequently asked questions
- When is the last frost in Rockport, WA?
- For ZIP code 98283, the average last spring frost (32°F) is April 16, based on NOAA 1991-2020 climate normals for the Darrington 21 Nne, WA weather station. There is a 1-in-10 chance of a frost after May 6.
- When is the first frost in Rockport, WA?
- The average first fall frost (32°F) is October 25. There is a 1-in-10 chance of frost by October 10, so tender plants are at risk from that point on.
- How long is the growing season in 98283?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 192 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.