Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Ironwood, MI, based on the USDA Hardiness Zone 4a.
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Ironwood, MI Frost Dates & Growing Season
Last Spring Frost Date for Ironwood, MI
The average last frost date in spring for Ironwood is June 5th. For gardeners planting sensitive crops like tomatoes, peppers, and basil, it is generally recommended to wait until June 19th before moving plants outdoors. Waiting these extra few weeks significantly reduces the risk of a late freeze damaging young transplants.
First Fall Frost Date for Ironwood, MI
The average first frost date in fall for Ironwood is September 25th. This date marks the approximate end of the growing season for tender plants. Gardeners should plan to harvest frost-sensitive vegetables or provide heavy protection (such as row covers) before this date to avoid crop loss.
Growing Season Length in Ironwood, MI
Based on historical frost data, the estimated growing season length in Ironwood is approximately 112 days. This duration determines which vegetable varieties have enough time to reach maturity before the winter cold sets in. Short-season varieties are recommended for crops that require a longer warm period.
Please note: These dates are climatological averages. Actual weather conditions vary by year. Always check the local 10-day forecast before planting.
Ironwood, MI Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Ironwood, MI Monthly Planting Recommendations
March
In March, recommended activities include starting Geranium seeds indoors (from March 27th to April 10th), starting Onion seeds indoors (from March 27th to April 10th), and starting Snapdragon seeds indoors (from March 27th to April 10th).
April
In April, recommended activities include starting Pepper seeds indoors (from April 10th to April 24th), starting Ground Cherry seeds indoors (from April 10th to April 24th), and starting Kale seeds indoors (from April 24th to May 8th).
May
In May, recommended activities include direct sowing Chives (from May 8th to May 22nd), direct sowing Parsley (from May 8th to May 22nd), and direct sowing Bok Choy (from May 8th to May 22nd).
June
In June, recommended activities include direct sowing Cantaloupe (from June 12th to June 26th), direct sowing Corn (from June 19th to June 26th), and direct sowing Watermelon (from June 19th to July 3rd).