When to Plant Pumpkins in Billings, MT
Published: April 24, 2026
Pumpkin Planting Dates for Billings, MT
| Start seeds indoors | April 16–23 |
| Last frost (average) | May 7 |
| Transplant outdoors | May 14–24 |
| Direct sow outdoors | May 14–24 |
| Minimum soil temperature | 60°F |
| Expect first harvest | July 28 – August 22 |
| First fall frost (average) | October 1 |
⚠ Count back 75–100 days from desired harvest date. For Halloween harvest, plant late June to mid-July. Plant 1–2 weeks after last frost.
Best Pumpkin Varieties for Billings, MT
Consult a Billings-area nursery or your state extension office for pumpkin varieties proven in Zone 4b.
Growing Pumpkins in Billings
Billings 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. Warm-season crops like pumpkin need soil at 60°F or above before transplanting; Billings's frost calendar puts that window clearly in the late-spring to early-fall range.
Billings's short growing season makes indoor seed starting essential for pumpkin. Missing the April 16–23 start date by even two weeks often means plants do not reach producing size before the first fall frost shuts them down. Row covers and cold frames extend both ends of the season by 2–3 weeks each.
Billings's well-draining loam soils are among the best for pumpkin growing — focus on annual organic matter additions (2 to 3 inches of compost) and consistent moisture during drier months. Water pumpkin at 2 inches per week; loam holds moisture evenly without the drought-crack cycle of heavy clay or the rapid-drain losses of pure sand.
Pumpkin Calendar for Billings
| Month | Task |
|---|---|
| April | Start seeds indoors under grow lights |
| May | Transplant outdoors into warm soil |
| July | Expect first harvest window to open |
| October | First fall frost — harvest remaining, end of outdoor season |
Pumpkin Tips for Billings Gardeners
- •For Halloween pumpkins, count back 75–100 days from October 31 — plant between late June and mid-July in most climates.
- •Plant on hills or mounds to warm soil and improve drainage; two plants per hill is plenty.
- •Cover transplants with floating row covers for the first 2–3 weeks after setting them out in Billings. The 3–5°F of extra warmth dramatically improves early establishment.
Common Pumpkin Pests in Billings
- •Squash Vine Borer — peaks July in Zone 4b (active June–August); sudden wilting with frass at stem base; inject Bt into the stem or use row covers through flowering.
- •Squash Bug — peaks July in Zone 4b (active June–August); gray-brown shield bugs that suck plant sap; handpick and destroy egg clusters on leaf undersides.
- •Cucumber Beetle — peaks July in Zone 4b (active June–August); yellow and black striped beetles that spread bacterial wilt; trap with yellow sticky traps.
Check plants every 2–3 days during peak season — early intervention prevents most infestations from becoming serious.
What to Plant with Pumpkins in Billings
In Billings's cold climate, Corn and Bush Bean are the most beneficial plants to grow alongside pumpkin. Corn provides vertical support for climbing companions in the Three Sisters planting. Keep pumpkin away from Potato — it competes for nutrients and shares blight diseases. In short-season gardens, interplanting companions at transplant time maximizes each bed's productive weeks.
Frequently Asked Questions
When should I plant pumpkin in Billings, MT?
In Billings (Zone 4b), start pumpkin seeds indoors around April 16–23 and transplant outdoors around May 14–24. The city's average last frost of May 7 is the anchor date — count 3 weeks back for seed starting and 1 weeks forward for transplanting.
What zone is Billings, MT for pumpkin growing?
Billings is USDA Zone 4b. For pumpkin, this means a frost-free growing season of roughly 21 weeks running from May 7 to October 1. This is a tight window for warm-season crops like pumpkin — short-season varieties maximize harvest.
When is pumpkin harvest season in Billings?
Expect the first pumpkin harvest in Billings around July 28, with harvest continuing through August 22. This is based on 75–100 days from transplant or direct sow.
How long does it take to grow pumpkin in Billings, MT?
From transplant or direct sow to first harvest, pumpkin takes 75–100 days in Billings's climate. Based on a typical planting date of May 14–24, expect your first harvest around July 28. Billings's cooler Zone 4b climate often lands at the slower end of this range — cooler nights slow fruit development.
What soil does pumpkin need in Billings?
Billings's loam soil is near-ideal for pumpkin. 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.