Frost dates for 98005 — Bellevue, WA
Last spring frostMar 8median date
First fall frostNov 23median date
Growing season260 daysfrost-free
Hardiness zone9aZone 9a
How Bellevue compares
- In 8 years out of 10, the last spring frost in Bellevue falls between February 13 and March 29, a 44-day window. The first fall frost falls between November 4 and December 16.
- The median last frost is 44 days earlier than the Washington median of Apr 21.
- Its 260-day growing season is longer than 96% of the 491 Washington places with a regular frost season (state median 182 days).
- The last frost is 5 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 25 nights a year at or below 32°F.
- Compared with Seattle, WA, 12 km away, the last frost here is 5 days earlier than there and the growing season is 11 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | February 13 |
| 50% (median) | March 8 |
| 10% (safe for tender plants) | March 29 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 4 |
| 50% (median) | November 23 |
| 90% (late) | December 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 Bellevue, WA
Frost dates for 98005 — Bellevue, WA — last frost Mar 8, first frost Nov 23, zone 9a. whenisthelastfrost.com
Crop
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Start indoors: Dec 14 to Dec 28Transplant outside: Feb 8 to Feb 22
Start indoors: Dec 28 to Jan 11Start indoors: Dec 28 to Jan 11Transplant outside: Mar 22 to Apr 5
Start indoors: Dec 28 to Jan 11Start indoors: Dec 28 to Jan 11Transplant outside: Mar 22 to Apr 5
Start indoors: Jan 11 to Jan 25Transplant outside: Mar 15 to Mar 29
Start indoors: Jan 11 to Jan 25Transplant outside: Feb 15 to Mar 1Sow outdoors: Feb 8 to Mar 15Plant for fall: Sep 28 to Oct 26
Start indoors: Jan 11 to Jan 25Transplant outside: Feb 8 to Feb 22Sow outdoors: Feb 8 to Feb 22Plant for fall: Sep 14 to Oct 5
Start indoors: Jan 11 to Jan 25Transplant outside: Feb 22 to Mar 8Plant for fall: Aug 17 to Sep 7
Start indoors: Jan 11 to Jan 25Transplant outside: Feb 15 to Mar 1Plant for fall: Aug 17 to Sep 7
Start indoors: Jan 11 to Jan 25Transplant outside: Feb 22 to Mar 8Plant for fall: Aug 17 to Sep 7
Start indoors: Jan 25 to Feb 8Transplant outside: Mar 29 to Apr 12Sow outdoors: Mar 29 to Apr 12
Start indoors: Jan 25 to Feb 8Transplant outside: Mar 15 to Mar 29
Sow outdoors: Jan 25 to Feb 15Plant for fall: Aug 31 to Sep 21
Sow outdoors: Jan 25 to Feb 15Plant for fall: Sep 28 to Oct 19
Sow outdoors: Feb 1 to Mar 15Plant for fall: Oct 12 to Nov 2
Start indoors: Feb 8 to Feb 15Transplant outside: Mar 22 to Mar 29Sow outdoors: Mar 15 to Mar 29Plant for fall: Sep 7 to Sep 21
Start indoors: Feb 8 to Feb 15Sow outdoors: Mar 15 to Mar 29Plant for fall: Sep 14 to Sep 28
Start indoors: Feb 8 to Feb 15Sow outdoors: Mar 15 to Mar 29
Start indoors: Feb 8 to Feb 15Transplant outside: Mar 22 to Apr 5
Sow outdoors: Feb 15 to Mar 15Plant for fall: Aug 31 to Sep 14
Sow outdoors: Feb 15 to Mar 15Plant for fall: Sep 14 to Sep 28
Sow outdoors: Feb 15 to Mar 8
Sow outdoors: Feb 22 to Mar 22Plant for fall: Sep 14 to Sep 28
Sow outdoors: Feb 22 to Mar 15Plant for fall: Sep 28 to Oct 19
Sow outdoors: Mar 15 to Apr 5Plant for fall: Sep 7 to Sep 21
Sow outdoors: Mar 15 to Mar 29
Transplant outside: Mar 22 to Apr 12
Plant for fall: Nov 9 to Dec 14
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Bellevue, WA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Dec 14 – Dec 28 | Feb 8 – Feb 22 | — | — |
| Peppers | Dec 28 – Jan 11 | Mar 22 – Apr 5 | — | — |
| Eggplant | Dec 28 – Jan 11 | Mar 22 – Apr 5 | — | — |
| Tomatoes | Jan 11 – Jan 25 | Mar 15 – Mar 29 | — | — |
| Lettuce | Jan 11 – Jan 25 | Feb 15 – Mar 1 | Feb 8 – Mar 15 | Sep 28 – Oct 26 |
| Kale | Jan 11 – Jan 25 | Feb 8 – Feb 22 | Feb 8 – Feb 22 | Sep 14 – Oct 5 |
| Broccoli | Jan 11 – Jan 25 | Feb 22 – Mar 8 | — | Aug 17 – Sep 7 |
| Cabbage | Jan 11 – Jan 25 | Feb 15 – Mar 1 | — | Aug 17 – Sep 7 |
| Cauliflower | Jan 11 – Jan 25 | Feb 22 – Mar 8 | — | Aug 17 – Sep 7 |
| Okra | Jan 25 – Feb 8 | Mar 29 – Apr 12 | Mar 29 – Apr 12 | — |
| Basil | Jan 25 – Feb 8 | Mar 15 – Mar 29 | — | — |
| Peas | — | — | Jan 25 – Feb 15 | Aug 31 – Sep 21 |
| Spinach | — | — | Jan 25 – Feb 15 | Sep 28 – Oct 19 |
| Radishes | — | — | Feb 1 – Mar 15 | Oct 12 – Nov 2 |
| Cucumbers | Feb 8 – Feb 15 | Mar 22 – Mar 29 | Mar 15 – Mar 29 | Sep 7 – Sep 21 |
| Zucchini & Summer Squash | Feb 8 – Feb 15 | — | Mar 15 – Mar 29 | Sep 14 – Sep 28 |
| Winter Squash & Pumpkins | Feb 8 – Feb 15 | — | Mar 15 – Mar 29 | — |
| Melons & Watermelon | Feb 8 – Feb 15 | Mar 22 – Apr 5 | — | — |
| Carrots | — | — | Feb 15 – Mar 15 | Aug 31 – Sep 14 |
| Beets | — | — | Feb 15 – Mar 15 | Sep 14 – Sep 28 |
| Potatoes | — | — | Feb 15 – Mar 8 | — |
| Swiss Chard | — | — | Feb 22 – Mar 22 | Sep 14 – Sep 28 |
| Cilantro | — | — | Feb 22 – Mar 15 | Sep 28 – Oct 19 |
| Green Beans | — | — | Mar 15 – Apr 5 | Sep 7 – Sep 21 |
| Sweet Corn | — | — | Mar 15 – Mar 29 | — |
| Sweet Potatoes | — | Mar 22 – Apr 12 | — | — |
| Garlic | — | — | — | Nov 9 – Dec 14 |
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 Seattle Sand Pt Wsfo, WA weather station, 10 km away (elevation 59 ft (18 m)).
ZIP codes in Bellevue: 98004 98005 98006 98007 98008 98009 98015
Frost dates near Bellevue
- Medina Mar 8 · Nov 23
- Redmond Mar 8 · Nov 23
- Mercer Island Mar 13 · Nov 17
- Kirkland Mar 8 · Nov 23
- Sammamish Mar 30 · Nov 7
- Seattle Mar 13 · Nov 17
- Renton Mar 13 · Nov 16
- Issaquah Mar 30 · Nov 7
Frequently asked questions
When is the last frost in Bellevue, WA?
The median last spring frost in Bellevue, WA is March 8. There is still about a 10% chance of frost after March 29, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Bellevue, WA?
The median first fall frost is November 23, with about a 10% chance of frost before November 4.
How long is the growing season in Bellevue, WA?
About 260 days between the median last spring frost and first fall frost.
What planting zone is Bellevue, WA?
Bellevue, WA is in USDA hardiness zone 9a.