Twisp, WA frost dates
Last spring frostMay 15median date
First fall frostSep 22median date
Growing season130 daysfrost-free
Hardiness zone6bZone 6b
How Twisp compares
- In 8 years out of 10, the last spring frost in Twisp falls between April 30 and June 1, a 32-day window. The first fall frost falls between September 10 and October 2.
- The median last frost is 24 days later than the Washington median of Apr 21.
- Its 130-day growing season is longer than 7% of the 491 Washington places with a regular frost season (state median 182 days).
- The last frost is 23 days later than the zone 6b median of Apr 22. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6b chart.
- The weather station records an average of 177 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 30 |
| 50% (median) | May 15 |
| 10% (safe for tender plants) | June 1 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 10 |
| 50% (median) | September 22 |
| 90% (late) | October 2 |
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 Twisp, WA
Twisp, WA frost dates — last frost May 15, first frost Sep 22, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Feb 20 to Mar 6Transplant outside: Apr 17 to May 1
Start indoors: Mar 6 to Mar 20Transplant outside: May 29 to Jun 12
Start indoors: Mar 6 to Mar 20Transplant outside: May 29 to Jun 12
Start indoors: Mar 20 to Apr 3Transplant outside: May 22 to Jun 5
Start indoors: Mar 20 to Apr 3Transplant outside: Apr 24 to May 8Sow outdoors: Apr 17 to May 22Plant for fall: Jul 28 to Aug 25
Start indoors: Mar 20 to Apr 3Transplant outside: Apr 17 to May 1Sow outdoors: Apr 17 to May 1Plant for fall: Jul 14 to Aug 4
Start indoors: Mar 20 to Apr 3Transplant outside: May 1 to May 15Plant for fall: Jun 16 to Jul 7
Start indoors: Mar 20 to Apr 3Transplant outside: Apr 24 to May 8Plant for fall: Jun 16 to Jul 7
Start indoors: Mar 20 to Apr 3Transplant outside: May 1 to May 15Plant for fall: Jun 16 to Jul 7
Start indoors: Apr 3 to Apr 17Transplant outside: Jun 5 to Jun 19Sow outdoors: Jun 5 to Jun 19
Start indoors: Apr 3 to Apr 17Transplant outside: May 22 to Jun 5
Sow outdoors: Apr 3 to Apr 24Plant for fall: Jun 30 to Jul 21
Sow outdoors: Apr 3 to Apr 24Plant for fall: Jul 28 to Aug 18
Sow outdoors: Apr 10 to May 22Plant for fall: Aug 11 to Sep 1
Start indoors: Apr 17 to Apr 24Transplant outside: May 29 to Jun 5Sow outdoors: May 22 to Jun 5Plant for fall: Jul 7 to Jul 21
Start indoors: Apr 17 to Apr 24Sow outdoors: May 22 to Jun 5Plant for fall: Jul 14 to Jul 28
Start indoors: Apr 17 to Apr 24Sow outdoors: May 22 to Jun 5
Start indoors: Apr 17 to Apr 24Transplant outside: May 29 to Jun 12
Sow outdoors: Apr 24 to May 22Plant for fall: Jun 30 to Jul 14
Sow outdoors: Apr 24 to May 22Plant for fall: Jul 14 to Jul 28
Sow outdoors: Apr 24 to May 15
Sow outdoors: May 1 to May 29Plant for fall: Jul 14 to Jul 28
Sow outdoors: May 1 to May 22Plant for fall: Jul 28 to Aug 18
Sow outdoors: May 22 to Jun 12Plant for fall: Jul 7 to Jul 21
Sow outdoors: May 22 to Jun 5
Transplant outside: May 29 to Jun 19
Plant for fall: Sep 8 to Oct 13
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Twisp, WA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 20 – Mar 6 | Apr 17 – May 1 | — | — |
| Peppers | Mar 6 – Mar 20 | May 29 – Jun 12 | — | — |
| Eggplant | Mar 6 – Mar 20 | May 29 – Jun 12 | — | — |
| Tomatoes | Mar 20 – Apr 3 | May 22 – Jun 5 | — | — |
| Lettuce | Mar 20 – Apr 3 | Apr 24 – May 8 | Apr 17 – May 22 | Jul 28 – Aug 25 |
| Kale | Mar 20 – Apr 3 | Apr 17 – May 1 | Apr 17 – May 1 | Jul 14 – Aug 4 |
| Broccoli | Mar 20 – Apr 3 | May 1 – May 15 | — | Jun 16 – Jul 7 |
| Cabbage | Mar 20 – Apr 3 | Apr 24 – May 8 | — | Jun 16 – Jul 7 |
| Cauliflower | Mar 20 – Apr 3 | May 1 – May 15 | — | Jun 16 – Jul 7 |
| Okra | Apr 3 – Apr 17 | Jun 5 – Jun 19 | Jun 5 – Jun 19 | — |
| Basil | Apr 3 – Apr 17 | May 22 – Jun 5 | — | — |
| Peas | — | — | Apr 3 – Apr 24 | Jun 30 – Jul 21 |
| Spinach | — | — | Apr 3 – Apr 24 | Jul 28 – Aug 18 |
| Radishes | — | — | Apr 10 – May 22 | Aug 11 – Sep 1 |
| Cucumbers | Apr 17 – Apr 24 | May 29 – Jun 5 | May 22 – Jun 5 | Jul 7 – Jul 21 |
| Zucchini & Summer Squash | Apr 17 – Apr 24 | — | May 22 – Jun 5 | Jul 14 – Jul 28 |
| Winter Squash & Pumpkins | Apr 17 – Apr 24 | — | May 22 – Jun 5 | — |
| Melons & Watermelon | Apr 17 – Apr 24 | May 29 – Jun 12 | — | — |
| Carrots | — | — | Apr 24 – May 22 | Jun 30 – Jul 14 |
| Beets | — | — | Apr 24 – May 22 | Jul 14 – Jul 28 |
| Potatoes | — | — | Apr 24 – May 15 | — |
| Swiss Chard | — | — | May 1 – May 29 | Jul 14 – Jul 28 |
| Cilantro | — | — | May 1 – May 22 | Jul 28 – Aug 18 |
| Green Beans | — | — | May 22 – Jun 12 | Jul 7 – Jul 21 |
| Sweet Corn | — | — | May 22 – Jun 5 | — |
| Sweet Potatoes | — | May 29 – Jun 19 | — | — |
| Garlic | — | — | — | Sep 8 – Oct 13 |
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 Winthrop 1 Wsw, WA weather station, 13 km away (elevation 1,749 ft (533 m)).
Frost dates near Twisp
- Carlton Apr 21 · Oct 15
- Winthrop May 15 · Sep 22
- Methow Apr 21 · Oct 15
- Malott Apr 21 · Oct 15
- Mazama May 9 · Sep 29
- Conconully Apr 30 · Oct 7
- Brewster Apr 26 · Oct 11
- Pateros Apr 21 · Oct 15
- Stehekin Apr 27 · Oct 17
- Okanogan Apr 30 · Oct 7
Frequently asked questions
When is the last frost in Twisp, WA?
The median last spring frost in Twisp, WA is May 15. There is still about a 10% chance of frost after June 1, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Twisp, WA?
The median first fall frost is September 22, with about a 10% chance of frost before September 10.
How long is the growing season in Twisp, WA?
About 130 days between the median last spring frost and first fall frost.
What planting zone is Twisp, WA?
Twisp, WA is in USDA hardiness zone 6b.