When to Plant Peas in Bellingham, WA
Published: April 24, 2026
Pea Planting Dates for Bellingham, WA
| Start seeds indoors | Year-round |
| Last frost (average) | May 7 |
| Direct sow outdoors | April 2–12 |
| Minimum soil temperature | 40°F |
| Expect first harvest | May 27 – June 11 |
| Fall crop planting | July 23–August 2 |
| Fall crop harvest | September 16 |
| First fall frost (average) | October 1 |
⚠ Plant peas 4–6 weeks before last frost — one of the first vegetables of spring. Tolerate light frost. Also plant in late summer for a fall harvest.
Best Pea Varieties for Bellingham, WA
Consult a Bellingham-area nursery or your state extension office for pea varieties proven in Zone 4b.
Growing Peas in Bellingham
Bellingham sits in Zone 4b, with an average last frost of May 7 and first fall frost around October 1 — giving a 147-day frost-free growing season. Cool-season crops like pea benefit from Bellingham's cooler spring and fall windows, when temperatures stay in the 55–75°F sweet spot that produces the best flavor and least bolting.
Bellingham's cooler summers are close to ideal for pea. The same conditions that limit tomato and pepper yields benefit cool-season crops — slower bolting, sweeter flavor, and longer harvest windows. The fall pea crop in Bellingham is often more productive than the spring crop.
Bellingham's well-draining loam soils are among the best for pea growing — focus on annual organic matter additions (2 to 3 inches of compost) and consistent moisture during drier months. Water pea at 1 inches per week; loam holds moisture evenly without the drought-crack cycle of heavy clay or the rapid-drain losses of pure sand.
Pea Calendar for Bellingham
| Month | Task |
|---|---|
| Year | Start seeds indoors under grow lights |
| May | Last frost — soil warming, prepare bed |
| April | Direct sow seeds into warm soil |
| May | Expect first harvest window to open |
| July | Start fall crop — transplants or direct sow |
| October | First fall frost — harvest remaining, end of outdoor season |
Pea Tips for Bellingham Gardeners
- •Soak pea seeds overnight before planting to speed germination in cool soil.
- •Install a 4–6 foot trellis at planting time — peas climb from day one and produce more per square foot when supported.
- •Fall plantings in Bellingham often out-produce spring plantings — cooler temperatures slow bolting and concentrate flavor. Light frost can actually improve the taste of pea.
Common Pea Pests in Bellingham
- •Pea Aphid — peaks July in Zone 4b (active June–August); monitor closely during peak season and treat early.
- •Powdery Mildew — peaks July in Zone 4b (active June–August); white powdery coating on leaves; improve airflow and apply milk spray (1:9 milk-to-water).
- •Root Rot — peaks July in Zone 4b (active June–August); monitor closely during peak season and treat early.
Check plants every 2–3 days during peak season — early intervention prevents most infestations from becoming serious.
What to Plant with Peas in Bellingham
In Bellingham's cold climate, Carrot and Radish are the most beneficial plants to grow alongside pea. Carrot shares root-zone space without competing because carrot roots run deeper than most companions. Keep pea away from Onion — it inhibits bean and pea growth through sulfur-compound allelopathy. In short-season gardens, interplanting companions at transplant time maximizes each bed's productive weeks.
Frequently Asked Questions
When should I plant pea in Bellingham, WA?
In Bellingham (Zone 4b), direct sow pea around April 2–12. Soil must be at 40°F or warmer at 2-inch depth before sowing — cold soil rots the seeds.
What zone is Bellingham, WA for pea growing?
Bellingham is USDA Zone 4b. For pea, this means a frost-free growing season of roughly 21 weeks running from May 7 to October 1. Cool-season crops like pea thrive in this zone with both spring and fall planting windows available.
When is pea harvest season in Bellingham?
Expect the first pea harvest in Bellingham around May 27, with harvest continuing through June 11. This is based on 55–70 days from transplant or direct sow. A fall crop planted July 23–August 2 adds a second harvest around September 16.
How long does it take to grow pea in Bellingham, WA?
From transplant or direct sow to first harvest, pea takes 55–70 days in Bellingham's climate. Based on a typical planting date of April 2–12, expect your first harvest around May 27. Bellingham's cooler Zone 4b climate often lands at the slower end of this range — cooler nights slow fruit development.
What soil does pea need in Bellingham?
Bellingham's loam soil is near-ideal for pea. Work in 2–3 inches of compost before planting to boost organic matter and nutrient content. Minimal amendment is needed beyond that — loam holds moisture evenly without the drought-crack cycle of clay or the nutrient-loss issues of sandy soil.