When to Plant in Montana

Montana's gardening is defined by the 'Big Sky' and a short, intense growing season. With elevations ranging from high plains to mountain valleys, the climate is continental and can bring frost at almost any time of year in some locations.

Successful Montana gardeners are masters of season extension and variety selection. Using cold frames, row covers, and choosing short-season crops are essential strategies for getting a harvest before the early fall frosts arrive.

Common Mistakes

Planting warm-season crops without protection — even in summer, nighttime temperatures can drop significantly.
Ignoring the short frost-free window — some parts of Montana have less than 90 days of reliable warmth.
Underestimating the power of the sun — high altitude means intense UV rays that can stress young plants.
Not mulching for moisture — Montana's dry air and wind can quickly dehydrate a garden.

FAQ

What is the last frost date?

Last frost ranges from mid-May in the lower valleys to late June in the mountain regions.

When should I start tomatoes indoors in Montana?

Late March or April is usually the best time to start seeds indoors for a Montana garden.

Can I plant before the last frost?

Yes, hardy crops like peas, radishes, and kale can handle the cool spring weather common in Montana.

Why does timing vary so much within Montana?

Elevation and the continental divide create vastly different climate zones across the state.

What if I live in a frost-free area?

Montana has no frost-free areas; every part of the state sees freezing temperatures in winter.

How does Plan My Garden create my schedule?

We factor in your elevation and historical frost data to create a realistic and precise planting calendar.

City planting guides in Montana

Billings