Often efforts to start peas early are thwarted by cool rainy periods which rot seed in place. Peas are commercially grown in the foothills of the Blue Mountains and the Paloose often in rotation with other crops such as wheat. The longer cool season at these elevations is favorable for peas. Despite the potential for high temperatures, peas are commercially grown in the semiarid Lower Columbia Basin where, under irrigation, harvests can actually exceed those at cooler elevations. Home growers, even in semiarid climates, shouldn't overlook peas which, like other legumes, enrich the soil by fixing nitrogen.
Early planting helps maximize productivity before hot weather.
In the Lower Columbia Basin, peas are often planted on President's Day. However, planting should be postponed if the ground is still cold and wet. Choosing early varieties can also be helpful. Avoid seed rot. Preferably sow seed in a rich loam that retains moisture without being soggy.