Frost dates for 97060Troutdale, OR
The average last spring frost in Troutdale is March 26 and the average first fall frost is November 17, giving a typical growing season of about 237 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 26
- Average first fall frost
- Nov 17
- Growing season
- 237 days
Safer after Apr 21 (1-in-10 risk)
Possible by Oct 26 (1-in-10 risk)
First frost typically in 18 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 3 · Apr 24 · May 9 | Oct 11 · Oct 30 · Nov 21 | 189 days | 100% |
| Frost / freeze (32°F) | Feb 27 · Mar 26 · Apr 21 | Oct 26 · Nov 17 · Dec 10 | 237 days | 100% |
| Hard freeze (28°F) | Jan 15 · Feb 22 · Mar 21 | Nov 14 · Dec 7 · Jan 11 | 292 days | 99% |
Planting calendar for Troutdale
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 23 – May 1 |
| Tomatoes | Transplant outdoors | Apr 11 – Jul 28 |
| Peppers | Start seeds indoors | Feb 23 – Mar 26 |
| Peppers | Transplant outdoors | Apr 25 – May 26 |
| Eggplant | Start seeds indoors | Mar 12 – Apr 10 |
| Eggplant | Transplant outdoors | Apr 25 – May 26 |
| Cucumbers | Sow outdoors | Apr 25 – Aug 7 |
| Summer squash | Sow outdoors | Apr 11 – May 26 |
| Winter squash & pumpkins | Sow outdoors | Apr 25 – May 26 |
| Snap beans | Sow outdoors | Apr 11 – Aug 30 |
| Sweet corn | Sow outdoors | Apr 11 – Jul 28 |
| Watermelon & cantaloupe | Sow outdoors | Apr 25 – May 26 |
| Okra | Sow outdoors | Apr 18 – May 11 |
| Peas | Sow outdoors (spring) | Feb 23 – Apr 10 |
| Potatoes | Plant outdoors (spring) | Feb 23 – Apr 25 |
| Onions | Start seeds indoors (spring) | Jan 12 – Feb 8 |
| Onions | Transplant outdoors (spring) | Mar 12 – Apr 10 |
| Broccoli | Start seeds indoors (spring) | Feb 5 – Mar 11 |
| Broccoli | Transplant outdoors (spring) | Mar 12 – Apr 10 |
| Broccoli | Start seeds indoors (fall) | Jul 18 – Jul 28 |
| Broccoli | Transplant outdoors (fall) | Aug 17 – Aug 28 |
| Cabbage | Start seeds indoors (spring) | Jan 26 – Feb 23 |
| Cabbage | Transplant outdoors (spring) | Feb 23 – Mar 26 |
| Cabbage | Start seeds indoors (fall) | Jul 8 – Aug 7 |
| Cabbage | Transplant outdoors (fall) | Aug 7 – Sep 7 |
| Leaf lettuce | Sow outdoors (spring) | Feb 23 – May 11 |
| Leaf lettuce | Sow outdoors (fall) | Aug 7 – Sep 23 |
| Spinach | Sow outdoors (spring) | Feb 16 – Apr 1 |
| Spinach | Sow outdoors (fall) | Aug 24 – Sep 28 |
| Radishes | Sow outdoors (spring) | Feb 23 – Apr 15 |
| Radishes | Sow outdoors (fall) | Aug 7 – Oct 8 |
| Kale | Sow outdoors (spring) | Mar 12 – Apr 1 |
| Kale | Sow outdoors (fall) | Jul 31 – Sep 7 |
| Carrots | Sow outdoors (spring) | Mar 26 – May 11 |
| Carrots | Sow outdoors (fall) | Jul 8 – Aug 23 |
| Garlic | Plant outdoors (fall) | Nov 7 – Dec 8 |
Where these dates come from
ZIP code 97060 is matched to the NOAA station Troutdale, OR, 3.3 km away, at 33 ft elevation (0 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Troutdale, OR (used) | 33 ft | Mar 26 | Nov 17 |
| Portland Troutdale Ap, OR | 29 ft | Mar 16 | Nov 20 |
| Portland Wfo, OR | 21 ft | Mar 13 | Nov 22 |
| Skamania Fish Hatchery, WA | 435 ft | Apr 29 | Oct 22 |
Frost dates near Troutdale
- Gresham, OR 97030 · last Mar 16, first Nov 20
- Fairview, OR 97024 · last Mar 16, first Nov 20
- Washougal, WA 98671 · last Apr 29, first Oct 22
- Camas, WA 98607 · last Mar 26, first Nov 17
- Portland, OR 97233 · last Mar 13, first Nov 22
- Corbett, OR 97019 · last Mar 27, first Nov 18
- Boring, OR 97009 · last Mar 27, first Nov 14
- Damascus, OR 97089 · last Mar 27, first Nov 14
Frequently asked questions
- When is the last frost in Troutdale, OR?
- For ZIP code 97060, the average last spring frost (32°F) is March 26, based on NOAA 1991-2020 climate normals for the Troutdale, OR weather station. There is a 1-in-10 chance of a frost after April 21.
- When is the first frost in Troutdale, OR?
- The average first fall frost (32°F) is November 17. There is a 1-in-10 chance of frost by October 26, so tender plants are at risk from that point on.
- How long is the growing season in 97060?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 237 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.