Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Harrison, IL, based on the USDA Hardiness Zone 6b.
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Harrison, IL Frost Dates & Growing Season
Last Spring Frost Date for Harrison, IL
The average last frost date in spring for Harrison is April 12th. For gardeners planting sensitive crops like tomatoes, peppers, and basil, it is generally recommended to wait until April 26th 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 Harrison, IL
The average first frost date in fall for Harrison is October 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 Harrison, IL
Based on historical frost data, the estimated growing season length in Harrison is approximately 196 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.
Harrison, IL Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Harrison, IL Monthly Planting Recommendations
February
In February, recommended activities include starting Impatiens seeds indoors (from February 1st to February 15th), starting Geranium seeds indoors (from February 1st to February 15th), and starting Stevia seeds indoors (from February 15th to March 1st).
March
In March, recommended activities include direct sowing Parsley (from March 15th to March 29th), starting Moonflower seeds indoors (from March 1st to March 15th), and direct sowing Sorrel (from March 15th to March 29th).
April
In April, recommended activities include direct sowing Black Bean (from April 26th to May 10th), direct sowing Zucchini (from April 19th to May 3rd), and direct sowing Lima Bean (from April 26th to May 10th).