Frost dates for 97229 — Portland, OR
How Portland compares
- In 8 years out of 10, the last spring frost in Portland falls between December 26 and March 5, a 69-day window. The first fall frost falls between November 11 and January 12.
- The median last frost is 64 days earlier than the Oregon median of Apr 16.
- Its 297-day growing season is among the longest of the 345 Oregon places with a regular frost season.
- The last frost is 33 days earlier than the zone 8b median of Mar 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 8b chart.
- The weather station records an average of 10 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | December 26 |
| 50% (median) | February 11 |
| 10% (safe for tender plants) | March 5 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 11 |
| 50% (median) | December 5 |
| 90% (late) | January 12 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Portland, OR
Frost dates for 97229 — Portland, OR — last frost Feb 11, first frost Dec 5, zone 8b. whenisthelastfrost.com
When to plant vegetables in Portland, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Nov 19 – Dec 3 | Jan 14 – Jan 28 | — | — |
| Peppers | Dec 3 – Dec 17 | Feb 25 – Mar 11 | — | — |
| Eggplant | Dec 3 – Dec 17 | Feb 25 – Mar 11 | — | — |
| Tomatoes | Dec 17 – Dec 31 | Feb 18 – Mar 4 | — | — |
| Lettuce | Dec 17 – Dec 31 | Jan 21 – Feb 4 | Jan 14 – Feb 18 | Oct 10 – Nov 7 |
| Kale | Dec 17 – Dec 31 | Jan 14 – Jan 28 | Jan 14 – Jan 28 | Sep 26 – Oct 17 |
| Broccoli | Dec 17 – Dec 31 | Jan 28 – Feb 11 | — | Aug 29 – Sep 19 |
| Cabbage | Dec 17 – Dec 31 | Jan 21 – Feb 4 | — | Aug 29 – Sep 19 |
| Cauliflower | Dec 17 – Dec 31 | Jan 28 – Feb 11 | — | Aug 29 – Sep 19 |
| Okra | Dec 31 – Jan 14 | Mar 4 – Mar 18 | Mar 4 – Mar 18 | — |
| Basil | Dec 31 – Jan 14 | Feb 18 – Mar 4 | — | — |
| Peas | — | — | Dec 31 – Jan 21 | Sep 12 – Oct 3 |
| Spinach | — | — | Dec 31 – Jan 21 | Oct 10 – Oct 31 |
| Radishes | — | — | Jan 7 – Feb 18 | Oct 24 – Nov 14 |
| Cucumbers | Jan 14 – Jan 21 | Feb 25 – Mar 4 | Feb 18 – Mar 4 | Sep 19 – Oct 3 |
| Zucchini & Summer Squash | Jan 14 – Jan 21 | — | Feb 18 – Mar 4 | Sep 26 – Oct 10 |
| Winter Squash & Pumpkins | Jan 14 – Jan 21 | — | Feb 18 – Mar 4 | — |
| Melons & Watermelon | Jan 14 – Jan 21 | Feb 25 – Mar 11 | — | — |
| Carrots | — | — | Jan 21 – Feb 18 | Sep 12 – Sep 26 |
| Beets | — | — | Jan 21 – Feb 18 | Sep 26 – Oct 10 |
| Potatoes | — | — | Jan 21 – Feb 11 | — |
| Swiss Chard | — | — | Jan 28 – Feb 25 | Sep 26 – Oct 10 |
| Cilantro | — | — | Jan 28 – Feb 18 | Oct 10 – Oct 31 |
| Green Beans | — | — | Feb 18 – Mar 11 | Sep 19 – Oct 3 |
| Sweet Corn | — | — | Feb 18 – Mar 4 | — |
| Sweet Potatoes | — | Feb 25 – Mar 18 | — | — |
| Garlic | — | — | — | Nov 21 – Dec 26 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Nature Park-Beaverton, OR weather station, 6 km away (elevation 184 ft (56 m)).
ZIP codes in Portland: 97201 97202 97203 97204 97205 97206 97207 97208 97209 97210 97211 97212 97213 97214 97215 97216 97217 97218 97219 97220 97221 97222 97223 97224 97225 97227 97228 97229 97230 97231 97232 97233 97236 97238 97239 97240 97242 97250 97251 97252 97253 97254 97256 97258 97266 97267 97268 97269 97280 97281 97282 97283 97286 97290 97291 97292 97293 97294 97296 97298
Frost dates near Portland
- Beaverton Feb 11 · Dec 5
- Hillsboro Apr 16 · Oct 23
- Cornelius Apr 16 · Oct 26
- Lake Oswego Mar 18 · Nov 18
- Tualatin Apr 1 · Nov 6
- North Plains Apr 16 · Oct 23
- Marylhurst Mar 18 · Nov 18
- Sherwood Mar 21 · Nov 22
Frequently asked questions
When is the last frost in Portland, OR?
The median last spring frost in Portland, OR is February 11. There is still about a 10% chance of frost after March 5, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Portland, OR?
The median first fall frost is December 5, with about a 10% chance of frost before November 11.
How long is the growing season in Portland, OR?
About 297 days between the median last spring frost and first fall frost.
What planting zone is Portland, OR?
Portland, OR is in USDA hardiness zone 8b.