Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Flensburg, MN, based on the USDA Hardiness Zone 4a.
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Flensburg, MN Frost Dates & Growing Season
Last Spring Frost Date for Flensburg, MN
The average last frost date in spring for Flensburg is May 18th. For gardeners planting sensitive crops like tomatoes, peppers, and basil, it is generally recommended to wait until June 1st 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 Flensburg, MN
The average first frost date in fall for Flensburg is October 5th. 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 Flensburg, MN
Based on historical frost data, the estimated growing season length in Flensburg is approximately 140 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.
Flensburg, MN Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Flensburg, MN Monthly Planting Recommendations
March
In March, recommended activities include starting Stevia seeds indoors (from March 23rd to April 6th), starting Onion seeds indoors (from March 9th to March 23rd), and starting Broccoli seeds indoors (from March 23rd to April 6th).
April
In April, recommended activities include direct sowing Spinach (from April 6th to April 20th), starting Kale seeds indoors (from April 6th to April 20th), direct sowing Kale (from April 20th to May 4th), and direct sowing Parsley (from April 20th to May 4th).
May
In May, recommended activities include direct sowing Beet (from May 4th to May 18th), direct sowing Zinnia (from May 25th to June 8th), and direct sowing Cilantro (from May 4th to June 1st).
June
In June, recommended activities include direct sowing Watermelon (from June 1st to June 15th), direct sowing Sesame (from June 1st to June 15th), and direct sowing Melon (from June 1st to June 15th).