Cool-Season Vegetable

When to Plant Lettuce in Montana

Fast-growing and forgiving. Plant in spring and fall for a nearly year-round supply of fresh salad greens.

The Short Answer

Lettuce are cold-tolerant and do well in Montana's humid climate. You can direct sow 4 weeks before your last frost — that's as early as May 10 - May 30 in Western Montana. Montana gardeners can also plant a fall crop. Alkaline soils common. Thin, dry soils in east. Better soils in valleys. Wind erosion challenges.

Montana Frost Dates

Your planting dates depend on which part of Montana you're in. Here are the frost date ranges by region:

Region Zones Last Frost (Spring) First Frost (Fall)
Western Montana 4b, 5a, 5b May 10 - May 30 Sep 10 - Sep 30
Central Montana 3b, 4a, 4b May 15 - Jun 5 Sep 5 - Sep 20
Eastern Montana 3a, 3b, 4a May 10 - Jun 1 Sep 10 - Sep 25

Lettuce Planting Schedule for Montana

Western Montana (Zones 4b, 5a, 5b)

Average last frost: May 10 - May 30 · Average first frost: Sep 10 - Sep 30

Start Seeds Indoors
4 wks before frost
Transplant Outside
2 wks before frost
Direct Sow
4 wks before frost
Fall Planting
8 wks before first frost

Central Montana (Zones 3b, 4a, 4b)

Average last frost: May 15 - Jun 5 · Average first frost: Sep 5 - Sep 20

Start Seeds Indoors
4 wks before frost
Transplant Outside
2 wks before frost
Direct Sow
4 wks before frost
Fall Planting
8 wks before first frost

Eastern Montana (Zones 3a, 3b, 4a)

Average last frost: May 10 - Jun 1 · Average first frost: Sep 10 - Sep 25

Start Seeds Indoors
4 wks before frost
Transplant Outside
2 wks before frost
Direct Sow
4 wks before frost
Fall Planting
8 wks before first frost

Growing Lettuce in Montana

Lettuce in Montana's Climate

Your cool climate is actually excellent for lettuce — the crop thrives in 55-70°F conditions that you have for months. Direct sow as soon as soil thaws in spring and continue harvesting well into summer because your moderate temperatures delay bolting far longer than in southern states. Fall lettuce is equally productive. In the coldest zones, cold frames extend harvest into December.

Soil Considerations for Montana

Alkaline soils common. Thin, dry soils in east. Better soils in valleys. Wind erosion challenges.

Montana Climate & Growing Season

Short, intense growing season. Low humidity. Wide day-night temperature swings. Wind protection valuable.

Growing season length varies across Montana: Western Montana (4b, 5a, 5b) has a last frost around May 10 - May 30, while Eastern Montana (3a, 3b, 4a) sees frost end around May 10 - Jun 1. This difference matters for lettuce — adjust your planting dates to match your specific region.

Growing Tips

Succession plant every 2-3 weeks for continuous harvest. Shade cloth extends the season into warmer months.

Companion Planting

Plant lettuce alongside these companions for better growth:

Carrots Radishes Strawberries Chives

The Bottom Line

Lettuce can be grown successfully across Montana, but your exact planting dates depend on which region you're in. Western Montana gardeners should plan around a May 10 - May 30 last frost, while those in Eastern Montana can typically plant later. For exact dates based on your zip code, use our free planting date finder.

Related Guides

Lettuce Growing Guide National planting guide with all states Montana Planting Calendar All plants for Montana Lettuce in Alabama Alabama planting dates Lettuce in Alaska Alaska planting dates Lettuce in Arizona Arizona planting dates Lettuce in Arkansas Arkansas planting dates
Note: All dates are based on NOAA 30-year Climate Normals and represent historical averages, not predictions for any specific year. Always check your local weather forecast before planting frost-sensitive crops. Learn about our data sources.

Last reviewed: March 29, 2026

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