Oregon · zones 6a–9a
When to plant sweet potatoes in Oregon.
Sow or transplant between May 22 to Jul 6 in a typical year, keyed to Oregon's median last frost around Apr 15. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Sweet Potatoes dates for a typical Oregon season.
1 · Start indoors
Apr 10 to May 25
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
May 22 to Jul 6
Keyed to the ~Apr 15 last frost. Sow 3" deep, 14" apart.
Harvest
~110 days later
~2.5 lb per plant over ~1 weeks.
Oregon spans more than one climate: Zone 8 is the most common zone, but the state runs 6a to 9a. That's why the planner works from your ZIP code's frost dates, not your zone — mountain and coastal gardens in the same state can be three weeks apart.