Weston, OR frost dates
Last spring frostMar 25median date
First fall frostOct 29median date
Growing season218 daysfrost-free
Hardiness zone7aZone 7a
How Weston compares
- In 8 years out of 10, the last spring frost in Weston falls between March 6 and April 16, a 41-day window. The first fall frost falls between October 12 and November 16.
- The median last frost is 22 days earlier than the Oregon median of Apr 16.
- Its 218-day growing season is longer than 65% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 22 days earlier than the zone 7a median of Apr 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7a chart.
- The weather station records an average of 74 nights a year at or below 32°F.
- Compared with Pasco, WA, 74 km away, the last frost here is 33 days earlier than there and the growing season is 51 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 6 |
| 50% (median) | March 25 |
| 10% (safe for tender plants) | April 16 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 12 |
| 50% (median) | October 29 |
| 90% (late) | November 16 |
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 Weston, OR
Weston, OR frost dates — last frost Mar 25, first frost Oct 29, zone 7a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Dec 31 to Jan 14Start indoors: Dec 31 to Jan 14Transplant outside: Feb 25 to Mar 11
Start indoors: Jan 14 to Jan 28Transplant outside: Apr 8 to Apr 22
Start indoors: Jan 14 to Jan 28Transplant outside: Apr 8 to Apr 22
Start indoors: Jan 28 to Feb 11Transplant outside: Apr 1 to Apr 15
Start indoors: Jan 28 to Feb 11Transplant outside: Mar 4 to Mar 18Sow outdoors: Feb 25 to Apr 1Plant for fall: Sep 3 to Oct 1
Start indoors: Jan 28 to Feb 11Transplant outside: Feb 25 to Mar 11Sow outdoors: Feb 25 to Mar 11Plant for fall: Aug 20 to Sep 10
Start indoors: Jan 28 to Feb 11Transplant outside: Mar 11 to Mar 25Plant for fall: Jul 23 to Aug 13
Start indoors: Jan 28 to Feb 11Transplant outside: Mar 4 to Mar 18Plant for fall: Jul 23 to Aug 13
Start indoors: Jan 28 to Feb 11Transplant outside: Mar 11 to Mar 25Plant for fall: Jul 23 to Aug 13
Start indoors: Feb 11 to Feb 25Transplant outside: Apr 15 to Apr 29Sow outdoors: Apr 15 to Apr 29
Start indoors: Feb 11 to Feb 25Transplant outside: Apr 1 to Apr 15
Sow outdoors: Feb 11 to Mar 4Plant for fall: Aug 6 to Aug 27
Sow outdoors: Feb 11 to Mar 4Plant for fall: Sep 3 to Sep 24
Sow outdoors: Feb 18 to Apr 1Plant for fall: Sep 17 to Oct 8
Start indoors: Feb 25 to Mar 4Transplant outside: Apr 8 to Apr 15Sow outdoors: Apr 1 to Apr 15Plant for fall: Aug 13 to Aug 27
Start indoors: Feb 25 to Mar 4Sow outdoors: Apr 1 to Apr 15Plant for fall: Aug 20 to Sep 3
Start indoors: Feb 25 to Mar 4Sow outdoors: Apr 1 to Apr 15
Start indoors: Feb 25 to Mar 4Transplant outside: Apr 8 to Apr 22
Sow outdoors: Mar 4 to Apr 1Plant for fall: Aug 6 to Aug 20
Sow outdoors: Mar 4 to Apr 1Plant for fall: Aug 20 to Sep 3
Sow outdoors: Mar 4 to Mar 25
Sow outdoors: Mar 11 to Apr 8Plant for fall: Aug 20 to Sep 3
Sow outdoors: Mar 11 to Apr 1Plant for fall: Sep 3 to Sep 24
Sow outdoors: Apr 1 to Apr 22Plant for fall: Aug 13 to Aug 27
Sow outdoors: Apr 1 to Apr 15
Transplant outside: Apr 8 to Apr 29
Plant for fall: Oct 15 to Nov 19
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Weston, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Dec 31 – Jan 14 | Feb 25 – Mar 11 | — | — |
| Peppers | Jan 14 – Jan 28 | Apr 8 – Apr 22 | — | — |
| Eggplant | Jan 14 – Jan 28 | Apr 8 – Apr 22 | — | — |
| Tomatoes | Jan 28 – Feb 11 | Apr 1 – Apr 15 | — | — |
| Lettuce | Jan 28 – Feb 11 | Mar 4 – Mar 18 | Feb 25 – Apr 1 | Sep 3 – Oct 1 |
| Kale | Jan 28 – Feb 11 | Feb 25 – Mar 11 | Feb 25 – Mar 11 | Aug 20 – Sep 10 |
| Broccoli | Jan 28 – Feb 11 | Mar 11 – Mar 25 | — | Jul 23 – Aug 13 |
| Cabbage | Jan 28 – Feb 11 | Mar 4 – Mar 18 | — | Jul 23 – Aug 13 |
| Cauliflower | Jan 28 – Feb 11 | Mar 11 – Mar 25 | — | Jul 23 – Aug 13 |
| Okra | Feb 11 – Feb 25 | Apr 15 – Apr 29 | Apr 15 – Apr 29 | — |
| Basil | Feb 11 – Feb 25 | Apr 1 – Apr 15 | — | — |
| Peas | — | — | Feb 11 – Mar 4 | Aug 6 – Aug 27 |
| Spinach | — | — | Feb 11 – Mar 4 | Sep 3 – Sep 24 |
| Radishes | — | — | Feb 18 – Apr 1 | Sep 17 – Oct 8 |
| Cucumbers | Feb 25 – Mar 4 | Apr 8 – Apr 15 | Apr 1 – Apr 15 | Aug 13 – Aug 27 |
| Zucchini & Summer Squash | Feb 25 – Mar 4 | — | Apr 1 – Apr 15 | Aug 20 – Sep 3 |
| Winter Squash & Pumpkins | Feb 25 – Mar 4 | — | Apr 1 – Apr 15 | — |
| Melons & Watermelon | Feb 25 – Mar 4 | Apr 8 – Apr 22 | — | — |
| Carrots | — | — | Mar 4 – Apr 1 | Aug 6 – Aug 20 |
| Beets | — | — | Mar 4 – Apr 1 | Aug 20 – Sep 3 |
| Potatoes | — | — | Mar 4 – Mar 25 | — |
| Swiss Chard | — | — | Mar 11 – Apr 8 | Aug 20 – Sep 3 |
| Cilantro | — | — | Mar 11 – Apr 1 | Sep 3 – Sep 24 |
| Green Beans | — | — | Apr 1 – Apr 22 | Aug 13 – Aug 27 |
| Sweet Corn | — | — | Apr 1 – Apr 15 | — |
| Sweet Potatoes | — | Apr 8 – Apr 29 | — | — |
| Garlic | — | — | — | Oct 15 – Nov 19 |
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 Milton Freewater, OR weather station, 15 km away (elevation 971 ft (296 m)).
Frost dates near Weston
- Athena Mar 25 · Oct 29
- Adams May 12 · Sep 27
- Milton Freewater Mar 25 · Oct 29
- Helix May 12 · Sep 27
- Meacham frost any month
- Pendleton Apr 22 · Oct 9
- Summerville May 24 · Sep 18
- Elgin May 24 · Sep 18
- Imbler May 24 · Sep 18
- Pilot Rock May 7 · Oct 4
Frequently asked questions
When is the last frost in Weston, OR?
The median last spring frost in Weston, OR is March 25. There is still about a 10% chance of frost after April 16, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Weston, OR?
The median first fall frost is October 29, with about a 10% chance of frost before October 12.
How long is the growing season in Weston, OR?
About 218 days between the median last spring frost and first fall frost.
What planting zone is Weston, OR?
Weston, OR is in USDA hardiness zone 7a.