Snoqualmie Pass, WA frost dates
Last spring frostMay 14median date
First fall frostOct 17median date
Growing season156 daysfrost-free
Hardiness zone7aZone 7a
How Snoqualmie Pass compares
- In 8 years out of 10, the last spring frost in Snoqualmie Pass falls between April 26 and June 5, a 40-day window. The first fall frost falls between October 1 and November 1.
- The median last frost is 23 days later than the Washington median of Apr 21.
- Its 156-day growing season is longer than 23% of the 491 Washington places with a regular frost season (state median 182 days).
- The last frost is 28 days later 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 165 nights a year at or below 32°F.
- Compared with Sammamish, WA, 49 km away, the last frost here is 45 days later than there and the growing season is 66 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 26 |
| 50% (median) | May 14 |
| 10% (safe for tender plants) | June 5 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 1 |
| 50% (median) | October 17 |
| 90% (late) | November 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 Snoqualmie Pass, WA
Snoqualmie Pass, WA frost dates — last frost May 14, first frost Oct 17, zone 7a. whenisthelastfrost.com
Crop
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Start indoors: Feb 19 to Mar 5Transplant outside: Apr 16 to Apr 30
Start indoors: Mar 5 to Mar 19Transplant outside: May 28 to Jun 11
Start indoors: Mar 5 to Mar 19Transplant outside: May 28 to Jun 11
Start indoors: Mar 19 to Apr 2Transplant outside: May 21 to Jun 4
Start indoors: Mar 19 to Apr 2Transplant outside: Apr 23 to May 7Sow outdoors: Apr 16 to May 21Plant for fall: Aug 22 to Sep 19
Start indoors: Mar 19 to Apr 2Transplant outside: Apr 16 to Apr 30Sow outdoors: Apr 16 to Apr 30Plant for fall: Aug 8 to Aug 29
Start indoors: Mar 19 to Apr 2Transplant outside: Apr 30 to May 14Plant for fall: Jul 11 to Aug 1
Start indoors: Mar 19 to Apr 2Transplant outside: Apr 23 to May 7Plant for fall: Jul 11 to Aug 1
Start indoors: Mar 19 to Apr 2Transplant outside: Apr 30 to May 14Plant for fall: Jul 11 to Aug 1
Start indoors: Apr 2 to Apr 16Transplant outside: Jun 4 to Jun 18Sow outdoors: Jun 4 to Jun 18
Start indoors: Apr 2 to Apr 16Transplant outside: May 21 to Jun 4
Sow outdoors: Apr 2 to Apr 23Plant for fall: Jul 25 to Aug 15
Sow outdoors: Apr 2 to Apr 23Plant for fall: Aug 22 to Sep 12
Sow outdoors: Apr 9 to May 21Plant for fall: Sep 5 to Sep 26
Start indoors: Apr 16 to Apr 23Transplant outside: May 28 to Jun 4Sow outdoors: May 21 to Jun 4Plant for fall: Aug 1 to Aug 15
Start indoors: Apr 16 to Apr 23Sow outdoors: May 21 to Jun 4Plant for fall: Aug 8 to Aug 22
Start indoors: Apr 16 to Apr 23Sow outdoors: May 21 to Jun 4
Start indoors: Apr 16 to Apr 23Transplant outside: May 28 to Jun 11
Sow outdoors: Apr 23 to May 21Plant for fall: Jul 25 to Aug 8
Sow outdoors: Apr 23 to May 21Plant for fall: Aug 8 to Aug 22
Sow outdoors: Apr 23 to May 14
Sow outdoors: Apr 30 to May 28Plant for fall: Aug 8 to Aug 22
Sow outdoors: Apr 30 to May 21Plant for fall: Aug 22 to Sep 12
Sow outdoors: May 21 to Jun 11Plant for fall: Aug 1 to Aug 15
Sow outdoors: May 21 to Jun 4
Transplant outside: May 28 to Jun 18
Plant for fall: Oct 3 to Nov 7
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Snoqualmie Pass, WA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 19 – Mar 5 | Apr 16 – Apr 30 | — | — |
| Peppers | Mar 5 – Mar 19 | May 28 – Jun 11 | — | — |
| Eggplant | Mar 5 – Mar 19 | May 28 – Jun 11 | — | — |
| Tomatoes | Mar 19 – Apr 2 | May 21 – Jun 4 | — | — |
| Lettuce | Mar 19 – Apr 2 | Apr 23 – May 7 | Apr 16 – May 21 | Aug 22 – Sep 19 |
| Kale | Mar 19 – Apr 2 | Apr 16 – Apr 30 | Apr 16 – Apr 30 | Aug 8 – Aug 29 |
| Broccoli | Mar 19 – Apr 2 | Apr 30 – May 14 | — | Jul 11 – Aug 1 |
| Cabbage | Mar 19 – Apr 2 | Apr 23 – May 7 | — | Jul 11 – Aug 1 |
| Cauliflower | Mar 19 – Apr 2 | Apr 30 – May 14 | — | Jul 11 – Aug 1 |
| Okra | Apr 2 – Apr 16 | Jun 4 – Jun 18 | Jun 4 – Jun 18 | — |
| Basil | Apr 2 – Apr 16 | May 21 – Jun 4 | — | — |
| Peas | — | — | Apr 2 – Apr 23 | Jul 25 – Aug 15 |
| Spinach | — | — | Apr 2 – Apr 23 | Aug 22 – Sep 12 |
| Radishes | — | — | Apr 9 – May 21 | Sep 5 – Sep 26 |
| Cucumbers | Apr 16 – Apr 23 | May 28 – Jun 4 | May 21 – Jun 4 | Aug 1 – Aug 15 |
| Zucchini & Summer Squash | Apr 16 – Apr 23 | — | May 21 – Jun 4 | Aug 8 – Aug 22 |
| Winter Squash & Pumpkins | Apr 16 – Apr 23 | — | May 21 – Jun 4 | — |
| Melons & Watermelon | Apr 16 – Apr 23 | May 28 – Jun 11 | — | — |
| Carrots | — | — | Apr 23 – May 21 | Jul 25 – Aug 8 |
| Beets | — | — | Apr 23 – May 21 | Aug 8 – Aug 22 |
| Potatoes | — | — | Apr 23 – May 14 | — |
| Swiss Chard | — | — | Apr 30 – May 28 | Aug 8 – Aug 22 |
| Cilantro | — | — | Apr 30 – May 21 | Aug 22 – Sep 12 |
| Green Beans | — | — | May 21 – Jun 11 | Aug 1 – Aug 15 |
| Sweet Corn | — | — | May 21 – Jun 4 | — |
| Sweet Potatoes | — | May 28 – Jun 18 | — | — |
| Garlic | — | — | — | Oct 3 – Nov 7 |
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 Stampede Pass, WA weather station, 20 km away (elevation 3,960 ft (1,207 m)).
Frost dates near Snoqualmie Pass
- North Bend Apr 23 · Nov 1
- Skykomish Apr 14 · Oct 29
- Easton May 9 · Oct 6
- Snoqualmie Mar 30 · Nov 7
- Baring Apr 14 · Oct 29
- Ronald May 9 · Oct 6
- Ravensdale Apr 3 · Nov 11
- Fall City Mar 30 · Nov 7
- Preston Mar 30 · Nov 7
- Roslyn May 13 · Sep 25
Frequently asked questions
When is the last frost in Snoqualmie Pass, WA?
The median last spring frost in Snoqualmie Pass, WA is May 14. There is still about a 10% chance of frost after June 5, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Snoqualmie Pass, WA?
The median first fall frost is October 17, with about a 10% chance of frost before October 1.
How long is the growing season in Snoqualmie Pass, WA?
About 156 days between the median last spring frost and first fall frost.
What planting zone is Snoqualmie Pass, WA?
Snoqualmie Pass, WA is in USDA hardiness zone 7a.