When to plant southern pea in Portland, Oregon
February 25 – March 11
Direct-sow outdoors · typical Portland yearClimate basis: NOAA station Portland Kgw-tv, OR (USC00356749), 1 mi (1 km) from downtown Portland (ZCTA 97204 centroid), elevation 159 ft, on the 1991–2020 climate normals. Direct-sow southern pea from approximately the dates above, anchored to the median last spring 32°F freeze (February 25). One year in ten still freezes after March 21.
The Portland year
- indoors under lights
- in the garden
- frost-free season
- 1-in-10 years still freeze to Mar 21
Every method, with its sources
Direct-sow outdoors
Feb 25 – Mar 11Maryland Extension says to wait until all danger of frost is passed, Alabama Extension says to plant after any danger of frost has passed, and Texas A&M's crop guide lists the optimum time as soil above 65°F with danger of frost over; all three agree on the last-frost date, so the point rule opens the window at the anchor and runs 14 days. Anchored to the median last spring freeze (Feb 25). Alabama Cooperative Extension System · Texas A&M AgriLife Extension
Fall planting
Sep 17 – Sep 27Arkansas Extension gives an explicit frost-anchored fall range — plant about 65 to 75 days prior to the average frost date — which encodes directly as 75 to 65 days before the first fall freeze; it is the only source in this set that states fall timing relative to frost rather than by calendar month. Anchored to the median first fall freeze (Dec 1). University of Maryland Extension · Alabama Cooperative Extension System · University of Arkansas Cooperative Extension Service · Texas A&M AgriLife Extension
Variety assumption: Assumes a standard 60–70 day bush or semi-vining southern pea; the fall window is Arkansas' allowance for the crop to set and fill pods before the first freeze.
These windows describe typical years (1991–2020 climate normals), not this year's forecast. Freezes happen outside them — especially in frost pockets, valleys, and urban edges. Watch the forecast before committing tender plants.
Crop rule sources (4)
- Alabama Cooperative Extension System: Grow More Peas (Southern) (accessed 2026-07-25)"Plant April through July after any danger of frost has passed."
- Texas A&M AgriLife Extension: Southern Pea (Cowpea) — Commercial and Specialty Crop Guides (accessed 2026-07-25)"Optimum Time Soil temperature > 65°F and danger of frost is over"
- University of Maryland Extension: Growing Southern Peas in a Home Garden (accessed 2026-07-25)"Wait until all danger of frost is passed and the soil has warmed before planting."
- University of Arkansas Cooperative Extension Service: Southern Peas (FSA-6020), Home Gardening Series (accessed 2026-07-25)"For fall planting, plant about 65 to 75 days prior to the average frost date to be sure of production."