Cool-Season Vegetable

When to Plant Broccoli in Maine

A nutrition powerhouse that thrives in cool weather. Harvest the main head, then enjoy weeks of side shoots.

The Short Answer

Broccoli are cold-tolerant and do well in Maine's varied climate. You can direct sow 4 weeks before your last frost — that's as early as May 20 - Jun 5 in Northern Maine. Maine gardeners can also plant a fall crop. Acidic, rocky soils. Blueberries thrive naturally. Raised beds common to deal with rocks. Amendment...

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

Broccoli 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 before frost
Direct Sow
4 wks before frost
Fall Planting
10 wks before first 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 before frost
Direct Sow
4 wks before frost
Fall Planting
10 wks before first 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 before frost
Direct Sow
4 wks before frost
Fall Planting
10 wks before first frost

Growing Broccoli in Maine

Broccoli in Maine's Climate

Broccoli thrives in your cool climate. Spring planting works well — transplant 2-3 weeks before last frost. Unlike warmer regions where heat causes premature bolting, your moderate summer temperatures often allow extended broccoli harvests. Fall broccoli is equally productive. Northern Michigan, Minnesota, and Wisconsin can even grow broccoli through summer in cooler years.

Soil Considerations for Maine

Acidic, rocky soils. Blueberries thrive naturally. Raised beds common to deal with rocks. Amendment with lime needed for many vegetables.

Maine Climate & Growing Season

Short growing season but long summer days help. Maritime influence on coast. Season extension techniques very valuable. Broccoli can handle frost well, which is an advantage in Maine's climate. You can push planting dates earlier in spring and extend into fall.

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 broccoli — but broccoli handle frost well, so the timing difference is less critical.

Growing Tips

Harvest main head while buds are tight. Side shoots will continue producing for weeks after the main harvest.

Companion Planting

Plant broccoli alongside these companions for better growth:

Beets Celery Onions Potatoes

Keep broccoli away from:

Tomatoes Peppers Strawberries

The Bottom Line

Broccoli 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

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