When to Plant Sweet Potatoes in Washington
In a typical Washington location, plant outdoors Apr 7 – Apr 21. Across the state, the outdoor planting window starts as early as Mar 15 in Port Townsend and as late as Jun 13 in Cheney.
Set out slips 2-4 weeks after last frost once soil is thoroughly warm (65F+); very frost/cold sensitive.
Sweet Potatoes Planting Dates by City
| City | Plant outdoors |
|---|---|
| Seattle | Mar 27 – Apr 10 |
| Tri-Cities | May 11 – May 25 |
| Spokane | May 10 – May 24 |
| Tacoma | Mar 22 – Apr 5 |
| Vancouver | Apr 12 – Apr 26 |
| Bellevue | Mar 22 – Apr 5 |
| Kent | Apr 3 – Apr 17 |
| Everett | Apr 7 – Apr 21 |
| Renton | Mar 27 – Apr 10 |
| Federal Way | Mar 22 – Apr 5 |
| Spokane Valley | May 10 – May 24 |
| Yakima | May 22 – Jun 5 |
| Kirkland | Mar 22 – Apr 5 |
| Bellingham | Apr 15 – Apr 29 |
| Kennewick | Apr 11 – Apr 25 |
| Auburn | Apr 3 – Apr 17 |
| Pasco | Apr 11 – Apr 25 |
| Marysville | Apr 7 – Apr 21 |
| Redmond | Mar 22 – Apr 5 |
| Lakewood | Mar 25 – Apr 8 |
| Olympia | May 13 – May 27 |
| Shoreline | Mar 22 – Apr 5 |
| Richland | Apr 20 – May 4 |
| South Hill | Apr 25 – May 9 |
| Sammamish | Mar 22 – Apr 5 |
| Burien | Mar 16 – Mar 30 |
| Lacey | May 13 – May 27 |
| City of Sammamish | Apr 13 – Apr 27 |
| Bothell | Mar 22 – Apr 5 |
| Edmonds | Mar 23 – Apr 6 |
Showing the 30 most populous of 133 Washington cities. Dates are estimates from each city's NOAA frost normals and university extension timing guidelines. See all Washington cities.
Frequently Asked Questions
When should I plant sweet potatoes in Washington?
In a typical Washington location, plant outdoors Apr 7 – Apr 21. Across the state, the outdoor planting window starts as early as Mar 15 in Port Townsend and as late as Jun 13 in Cheney.
When is the last frost in Washington?
The average last spring frost in Washington ranges from March 1 in Port Townsend to May 30 in Cheney, based on NOAA 1991–2020 climate normals.
How long do sweet potatoes take to grow?
Sweet Potatoes typically take 90–120 days from planting to harvest. Set out slips 2-4 weeks after last frost once soil is thoroughly warm (65F+); very frost/cold sensitive.
Other Crops in Washington
- Tomatoes
- Peppers
- Eggplant
- Cucumbers
- Zucchini
- Winter Squash
- Pumpkins
- Watermelon
- Cantaloupe
- Corn
- Green Beans
- Peas
- Lettuce
- Spinach
- Kale
- Arugula
- Swiss Chard
- Broccoli
- Cauliflower
- Cabbage
- Brussels Sprouts
- Carrots
- Beets
- Radishes
- Turnips
- Onions
- Garlic
- Potatoes
- Asparagus
- Basil
- Cilantro
- Parsley
- Dill
- Oregano
- Thyme
- Sunflowers
- Zinnias
- Marigolds
- Cosmos
- Nasturtiums
- Dahlias
When to plant sweet potatoes in other states