When to Plant Peas in Green Bay, WI
Published: April 24, 2026
Pea Planting Dates for Green Bay, WI
| Start seeds indoors | Year-round |
| Last frost (average) | April 15 |
| Direct sow outdoors | March 11–21 |
| Minimum soil temperature | 40°F |
| Expect first harvest | May 5 – May 20 |
| Fall crop planting | August 6–16 |
| Fall crop harvest | September 30 |
| First fall frost (average) | October 15 |
⚠ 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 Green Bay, WI
Consult a Green Bay-area nursery or your state extension office for pea varieties proven in Zone 5a.
Growing Peas in Green Bay
Green Bay sits in Zone 5a, with an average last frost of April 15 and first fall frost around October 15 — giving a 183-day frost-free growing season. Cool-season crops like pea benefit from Green Bay's cooler spring and fall windows, when temperatures stay in the 55–75°F sweet spot that produces the best flavor and least bolting.
Green Bay'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 Green Bay is often more productive than the spring crop.
Green Bay's clay-loam soils are productive but benefit from annual compost amendment — 2 to 3 inches worked in before planting improves drainage and nutrient availability for pea. Consistent watering (1 inches per week) paired with organic mulch maintains the even moisture that clay-loam holds well. Avoid working wet soil in spring, which causes severe compaction in clay-loam blends.
Pea Calendar for Green Bay
| Month | Task |
|---|---|
| Year | Start seeds indoors under grow lights |
| April | Last frost — soil warming, prepare bed |
| March | Direct sow seeds into warm soil |
| May | Expect first harvest window to open |
| August | Start fall crop — transplants or direct sow |
| October | First fall frost — harvest remaining, end of outdoor season |
Pea Tips for Green Bay 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 Green Bay 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 Green Bay
- •Pea Aphid — peaks July in Zone 5a (active June–August); monitor closely during peak season and treat early.
- •Powdery Mildew — peaks July in Zone 5a (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 5a (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 Green Bay
In Green Bay'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 Green Bay, WI?
In Green Bay (Zone 5a), direct sow pea around March 11–21. Soil must be at 40°F or warmer at 2-inch depth before sowing — cold soil rots the seeds.
What zone is Green Bay, WI for pea growing?
Green Bay is USDA Zone 5a. For pea, this means a frost-free growing season of roughly 26 weeks running from April 15 to October 15. Cool-season crops like pea thrive in this zone with both spring and fall planting windows available.
When is pea harvest season in Green Bay?
Expect the first pea harvest in Green Bay around May 5, with harvest continuing through May 20. This is based on 55–70 days from transplant or direct sow. A fall crop planted August 6–16 adds a second harvest around September 30.
How long does it take to grow pea in Green Bay, WI?
From transplant or direct sow to first harvest, pea takes 55–70 days in Green Bay's climate. Based on a typical planting date of March 11–21, expect your first harvest around May 5. Green Bay's cooler Zone 5a climate often lands at the slower end of this range — cooler nights slow fruit development.
What soil does pea need in Green Bay?
Green Bay's clay-loam soil is productive for pea but benefits from annual compost amendment. Work 2–3 inches of compost into the top 10 inches before planting. Avoid working wet soil in spring — clay-loam compacts badly when wet. Consistent watering paired with organic mulch maintains the even moisture these soils hold well.