The optimal period for placing seed potatoes in the ground in this Pacific Northwest locale is largely dictated by soil temperature. Planting should commence when the soil has warmed to a consistent 45-50F (7-10C), approximately two to three weeks before the last expected frost. This usually falls within the timeframe of late March to late May, depending on the specific region within the state. Earlier planting is feasible in areas with milder microclimates, while later planting is advisable in cooler, higher elevation zones.
Adhering to the appropriate planting schedule is crucial for successful potato cultivation. Early planting in cold soil can lead to seed rot and delayed emergence, significantly reducing yields. Conversely, delaying planting past the ideal window may result in lower yields due to a shortened growing season and increased exposure to pests and diseases. Historically, the timing of potato planting was a significant factor in food security for agricultural communities, and remains a critical determinant of harvest success for both commercial growers and home gardeners today.
