Frost dates for 97224 — Portland, OR
How Portland compares
- In 8 years out of 10, the last spring frost in Portland falls between March 5 and April 26, a 52-day window. The first fall frost falls between October 19 and December 1.
- The median last frost is 15 days earlier than the Oregon median of Apr 16.
- Its 219-day growing season is longer than 66% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 29 days later than the zone 9a median of Mar 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 9a chart.
- The weather station records an average of 42 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 5 |
| 50% (median) | April 1 |
| 10% (safe for tender plants) | April 26 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 19 |
| 50% (median) | November 6 |
| 90% (late) | December 1 |
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 97224 — Portland, OR — last frost Apr 1, first frost Nov 6, zone 9a. whenisthelastfrost.com
When to plant vegetables in Portland, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 7 – Jan 21 | Mar 4 – Mar 18 | — | — |
| Peppers | Jan 21 – Feb 4 | Apr 15 – Apr 29 | — | — |
| Eggplant | Jan 21 – Feb 4 | Apr 15 – Apr 29 | — | — |
| Tomatoes | Feb 4 – Feb 18 | Apr 8 – Apr 22 | — | — |
| Lettuce | Feb 4 – Feb 18 | Mar 11 – Mar 25 | Mar 4 – Apr 8 | Sep 11 – Oct 9 |
| Kale | Feb 4 – Feb 18 | Mar 4 – Mar 18 | Mar 4 – Mar 18 | Aug 28 – Sep 18 |
| Broccoli | Feb 4 – Feb 18 | Mar 18 – Apr 1 | — | Jul 31 – Aug 21 |
| Cabbage | Feb 4 – Feb 18 | Mar 11 – Mar 25 | — | Jul 31 – Aug 21 |
| Cauliflower | Feb 4 – Feb 18 | Mar 18 – Apr 1 | — | Jul 31 – Aug 21 |
| Okra | Feb 18 – Mar 4 | Apr 22 – May 6 | Apr 22 – May 6 | — |
| Basil | Feb 18 – Mar 4 | Apr 8 – Apr 22 | — | — |
| Peas | — | — | Feb 18 – Mar 11 | Aug 14 – Sep 4 |
| Spinach | — | — | Feb 18 – Mar 11 | Sep 11 – Oct 2 |
| Radishes | — | — | Feb 25 – Apr 8 | Sep 25 – Oct 16 |
| Cucumbers | Mar 4 – Mar 11 | Apr 15 – Apr 22 | Apr 8 – Apr 22 | Aug 21 – Sep 4 |
| Zucchini & Summer Squash | Mar 4 – Mar 11 | — | Apr 8 – Apr 22 | Aug 28 – Sep 11 |
| Winter Squash & Pumpkins | Mar 4 – Mar 11 | — | Apr 8 – Apr 22 | — |
| Melons & Watermelon | Mar 4 – Mar 11 | Apr 15 – Apr 29 | — | — |
| Carrots | — | — | Mar 11 – Apr 8 | Aug 14 – Aug 28 |
| Beets | — | — | Mar 11 – Apr 8 | Aug 28 – Sep 11 |
| Potatoes | — | — | Mar 11 – Apr 1 | — |
| Swiss Chard | — | — | Mar 18 – Apr 15 | Aug 28 – Sep 11 |
| Cilantro | — | — | Mar 18 – Apr 8 | Sep 11 – Oct 2 |
| Green Beans | — | — | Apr 8 – Apr 29 | Aug 21 – Sep 4 |
| Sweet Corn | — | — | Apr 8 – Apr 22 | — |
| Sweet Potatoes | — | Apr 15 – May 6 | — | — |
| Garlic | — | — | — | Oct 23 – Nov 27 |
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 Beaverton 2 Ssw, OR weather station, 5 km away (elevation 269 ft (82 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
- Tualatin Apr 1 · Nov 6
- Lake Oswego Mar 18 · Nov 18
- Sherwood Mar 21 · Nov 22
- Beaverton Feb 11 · Dec 5
- Marylhurst Mar 18 · Nov 18
- Wilsonville Mar 18 · Nov 13
- West Linn Mar 18 · Nov 18
- Gladstone Mar 18 · Nov 18
Frequently asked questions
When is the last frost in Portland, OR?
The median last spring frost in Portland, OR is April 1. There is still about a 10% chance of frost after April 26, 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 November 6, with about a 10% chance of frost before October 19.
How long is the growing season in Portland, OR?
About 219 days between the median last spring frost and first fall frost.
What planting zone is Portland, OR?
Portland, OR is in USDA hardiness zone 9a.