Annual Flower

When to Plant Marigolds in Michigan

The ultimate companion plant. Marigolds repel pests, attract pollinators, and add cheerful color all season long.

The Short Answer

Marigolds are a Michigan garden essential — reliable, colorful, and effective as companion plants for vegetable crops.

Michigan Frost Dates

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

Region Zones Last Frost (Spring) First Frost (Fall)
Upper Peninsula 4a, 4b, 5a May 15 - Jun 5 Sep 10 - Sep 25
Northern Lower Michigan 5a, 5b May 10 - May 25 Sep 20 - Oct 5
Southern Michigan 5b, 6a, 6b Apr 25 - May 10 Oct 1 - Oct 15

Marigolds Planting Schedule for Michigan

Upper Peninsula (Zones 4a, 4b, 5a)

Average last frost: May 15 - Jun 5 · Average first frost: Sep 10 - Sep 25

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

Northern Lower Michigan (Zones 5a, 5b)

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

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

Southern Michigan (Zones 5b, 6a, 6b)

Average last frost: Apr 25 - May 10 · Average first frost: Oct 1 - Oct 15

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

Growing Marigolds in Michigan

State-Specific Growing Tips

Transplant after last frost or direct sow from late May. Marigolds produce well in Michigan's moderate summers. French marigolds among vegetable crops deter pests. Deadhead for continuous bloom through frost.

Recommended Varieties for Michigan

French marigolds for pest control. African for borders. Signet for edible flowers.

Common Challenges in Michigan

Slugs on young plants. Minimal other issues. One of Michigan's most trouble-free flowers.

Growing Tips

French marigolds are best for pest control in vegetable gardens. Deadhead spent flowers to keep them blooming until frost.

Companion Planting

Plant marigolds alongside these companions for better growth:

Tomatoes Peppers Squash Beans

The Bottom Line

Marigolds can be grown successfully in Michigan with proper attention to regional frost dates and local growing conditions. Timing varies across the state — Upper Peninsula gardeners work with a last frost around May 15 - Jun 5, while Southern Michigan sees frost end around Apr 25 - May 10. Choose varieties suited to your region, amend your soil based on its specific needs, and monitor for the pests and diseases most common in your area. For exact dates based on your zip code, use our free planting date finder.

Related Guides

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