Warm-Season Vegetable

When to Plant Tomatoes in Maine

America's favorite garden vegetable (technically a fruit). Nothing beats a sun-warmed tomato straight off the vine.

The Short Answer

In Maine, tomatoes planting dates vary by region. In Northern Maine, your average last frost is around May 20 - Jun 5, while Southern/Coastal Maine sees its last frost around May 1 - May 15. Since tomatoes are frost-sensitive, start seeds indoors 6 weeks before your last frost, then transplant outside 2 weeks after frost danger has passed. Acidic, rocky soils. Blueberries thrive naturally. Raised beds common to deal with rocks. Amendment with lime needed...

Maine Frost Dates

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

Region Zones Last Frost (Spring) First Frost (Fall)
Northern Maine 3b, 4a, 4b May 20 - Jun 5 Sep 10 - Sep 25
Central Maine 4b, 5a May 10 - May 25 Sep 20 - Oct 5
Southern/Coastal Maine 5a, 5b, 6a May 1 - May 15 Sep 25 - Oct 15

Tomatoes Planting Schedule for Maine

Northern Maine (Zones 3b, 4a, 4b)

Average last frost: May 20 - Jun 5 · Average first frost: Sep 10 - Sep 25

Start Seeds Indoors
6 wks before frost
Transplant Outside
2 wks after frost
Direct Sow
2 wks after frost

Central Maine (Zones 4b, 5a)

Average last frost: May 10 - May 25 · Average first frost: Sep 20 - Oct 5

Start Seeds Indoors
6 wks before frost
Transplant Outside
2 wks after frost
Direct Sow
2 wks after frost

Southern/Coastal Maine (Zones 5a, 5b, 6a)

Average last frost: May 1 - May 15 · Average first frost: Sep 25 - Oct 15

Start Seeds Indoors
6 wks before frost
Transplant Outside
2 wks after frost
Direct Sow
2 wks after frost

Growing Tomatoes in Maine

Tomatoes in Maine's Climate

In cold climates with 120-160 frost-free days, tomatoes demand an aggressive indoor start 6-8 weeks before your last frost. Choose short-season varieties that mature in 55-65 days — Stupice, Sub Arctic Plenty, and Glacier are bred for regions exactly like yours. Black plastic mulch can raise soil temperature by 10-15°F, and floating row cover over transplants during cool June nights adds critical warmth. Your goal is getting ripe tomatoes before September frost — every warm day counts.

Soil Considerations for Maine

Acidic, rocky soils. Blueberries thrive naturally. Raised beds common to deal with rocks. Amendment with lime needed for many vegetables. Make sure soil has warmed to at least 60°F before planting tomatoes outside.

Maine Climate & Growing Season

Short growing season but long summer days help. Maritime influence on coast. Season extension techniques very valuable. Tomatoes cannot tolerate any frost, so wait until all frost danger has passed before transplanting outside. Watch local forecasts carefully in spring.

Growing season length varies across Maine: Northern Maine (3b, 4a, 4b) has a last frost around May 20 - Jun 5, while Southern/Coastal Maine (5a, 5b, 6a) sees frost end around May 1 - May 15. This difference matters for tomatoes — transplant timing shifts by several weeks across the state.

Growing Tips

Pinch off suckers for indeterminate varieties. Stake or cage for best results. Water at the base, not overhead, to prevent blight.

Companion Planting

Plant tomatoes alongside these companions for better growth:

Basil Carrots Peppers Marigolds

Keep tomatoes away from:

Brassicas Fennel Dill

The Bottom Line

Tomatoes can be grown successfully across Maine, but your exact planting dates depend on which region you're in. Northern Maine gardeners should plan around a May 20 - Jun 5 last frost, while those in Southern/Coastal Maine can typically plant earlier. For exact dates based on your zip code, use our free planting date finder.

Related Guides

Tomatoes Growing Guide National planting guide with all states Maine Planting Calendar All plants for Maine Tomatoes in Alabama Alabama planting dates Tomatoes in Alaska Alaska planting dates Tomatoes in Arizona Arizona planting dates Tomatoes 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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