Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Rock island, IL, based on the USDA Hardiness Zone 5b.
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Rock island, IL Frost Dates & Growing Season
Last Spring Frost Date for Rock island, IL
The average last frost date in spring for Rock island is April 20th. For gardeners planting sensitive crops like tomatoes, peppers, and basil, it is generally recommended to wait until May 4th 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 Rock island, IL
The average first frost date in fall for Rock island is October 15th. 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 Rock island, IL
Based on historical frost data, the estimated growing season length in Rock island is approximately 178 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.
Rock island, IL Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Rock island, IL Monthly Planting Recommendations
February
In February, recommended activities include starting Cabbage seeds indoors (from February 23rd to March 9th), starting Tomatillo seeds indoors (from February 23rd to March 9th), and starting Lavender seeds indoors (from February 9th to February 23rd).
March
In March, recommended activities include direct sowing Watercress (from March 23rd to April 6th), direct sowing Flax (from March 23rd to April 6th), and direct sowing Potato (from March 23rd to April 6th).
April
In April, recommended activities include direct sowing Beet (from April 6th to April 20th), direct sowing Cilantro (from April 6th to May 4th), and direct sowing Runner Bean (from April 27th to May 11th).
May
In May, recommended activities include direct sowing Okra (from May 4th to May 18th), direct sowing Butterfly Pea (from May 4th to May 18th), and direct sowing Watermelon (from May 4th to May 18th).