Growing pea in zone 5b

In zone 5b, the last spring frost typically falls in late April to early May. Peas tolerate light frost and can be direct-sown 4 to 6 weeks before that date, meaning mid-March plantings are feasible once soil temperature reaches around 45°F. Bloom follows sowing by roughly 50 to 60 days, placing flowers in mid-May to early June for typical spring sowings. Harvest for shelling varieties like Lincoln runs late May through June; Sugar Snap and Oregon Sugar Pod II extend harvesting somewhat longer in cool years. A fall planting started in late July can yield a second harvest before the first fall frost, which arrives around mid-October in most of zone 5b.

The main timing adjustment for zone 5b is planting early enough to capture the full cool window before July heat ends production. Seeds sown after early May lose several weeks of productive growing weather. Soil in zone 5b may still be wet and cold in mid-March; raised beds warm faster and allow earlier establishment. Vegetable powdery mildew pressure increases as late-spring temperatures climb; Oregon Sugar Pod II shows moderate resistance, but adequate plant spacing and avoiding overhead irrigation reduce incidence regardless of variety. Fall plantings require attention to both temperature and day length: seeds sown after August 1 may not have enough growing days for full pod development before frost. Trellising practices are consistent across the crop's range and require no zone-specific modification.