When to Plant Sweet Corn in Oregon
In Oregon, the time to sow sweet corn outside runs from Feb 28 – Mar 14 in Coos Bay to Jun 16 – Jun 30 in Redmond. In Portland, it's Mar 4 – Mar 18. The average last spring frost differs by about 15 weeks across the state (Feb 21 in Coos Bay, Jun 9 in Redmond), so use the dates for the town nearest you.
Sow corn in blocks rather than single rows so it pollinates well. Wait for soil around 60°F.
- Sow outside: 1–3 weeks after the last frost.
Sweet Corn planting dates in Oregon by city
| City | Zone | Sow outside |
|---|---|---|
| Albany | 8b | Apr 24 – May 8 |
| Ashland | 8a | May 13 – May 27 |
| Beaverton | 9a | Apr 8 – Apr 22 |
| Bend | 6b | Jun 13 – Jun 27 |
| Canby | 8b | Mar 25 – Apr 8 |
| Central Point | 8b | Apr 15 – Apr 29 |
| Coos Bay | 9a | Feb 28 – Mar 14 |
| Cornelius | 8b | Apr 23 – May 7 |
| Corvallis | 8b | Apr 24 – May 8 |
| Dallas | 8b | Apr 23 – May 7 |
| Eugene | 8b | Apr 18 – May 2 |
| Forest Grove | 8b | Apr 23 – May 7 |
| Grants Pass | 8b | Apr 15 – Apr 29 |
| Gresham | 9a | Mar 23 – Apr 6 |
| Happy Valley | 8b | Mar 25 – Apr 8 |
| Hermiston | 7b | May 3 – May 17 |
| Hillsboro | 8b | Apr 23 – May 7 |
| Keizer | 8b | Apr 10 – Apr 24 |
| Klamath Falls | 6b | Jun 16 – Jun 30 |
| Lake Oswego | 9a | Mar 25 – Apr 8 |
| Lebanon | 8b | Mar 21 – Apr 4 |
| McMinnville | 8b | Apr 12 – Apr 26 |
| Medford | 8b | Apr 15 – Apr 29 |
| Milwaukie | 9a | Mar 4 – Mar 18 |
| Newberg | 8b | Mar 28 – Apr 11 |
| Oregon City | 9a | Mar 25 – Apr 8 |
| Pendleton | 7a | Apr 29 – May 13 |
| Portland | 8b | Mar 4 – Mar 18 |
| Redmond | 6b | Jun 16 – Jun 30 |
| Roseburg | 8b | Mar 30 – Apr 13 |
| Salem | 8b | Apr 10 – Apr 24 |
| Sherwood | 8b | Mar 28 – Apr 11 |
| Springfield | 8b | Apr 18 – May 2 |
| The Dalles | 8a | Apr 18 – May 2 |
| Tigard | 9a | Apr 8 – Apr 22 |
| Troutdale | 9a | Apr 2 – Apr 16 |
| Tualatin | 9a | Apr 8 – Apr 22 |
| West Linn | 9a | Mar 25 – Apr 8 |
| Wilsonville | 8b | Mar 25 – Apr 8 |
| Woodburn | 8b | Mar 23 – Apr 6 |
Calculated from each town's average (50%) frost dates, from the nearest NOAA station (1991–2020). Typical dates for the 2027 planting season, based on NOAA's 1991–2020 averages. They are long-term odds, not a forecast: always check your local forecast before planting. Zones: 2023 USDA Plant Hardiness Zone Map (USDA-ARS and Oregon State University). Not the official map; see planthardiness.ars.usda.gov.
See all frost dates in Oregon, or the general guide to when to plant sweet corn.
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