Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Olathe, CO, based on the USDA Hardiness Zone 6b.
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Olathe, CO Frost Dates & Growing Season
Last Spring Frost Date for Olathe, CO
The average last frost date in spring for Olathe is May 15th. For gardeners planting sensitive crops like tomatoes, peppers, and basil, it is generally recommended to wait until May 29th 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 Olathe, CO
The average first frost date in fall for Olathe is October 10th. 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 Olathe, CO
Based on historical frost data, the estimated growing season length in Olathe is approximately 148 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.
Olathe, CO Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Olathe, CO Monthly Planting Recommendations
March
In March, recommended activities include starting Aubergine seeds indoors (from March 20th to April 3rd), starting Ground Cherry seeds indoors (from March 20th to April 3rd), and starting Coleus seeds indoors (from March 20th to April 3rd).
April
In April, recommended activities include starting Cantaloupe seeds indoors (from April 17th to May 1st), direct sowing Spinach (from April 3rd to April 17th), and starting Basil seeds indoors (from April 3rd to April 17th).
May
In May, recommended activities include direct sowing Mung Bean (from May 29th to June 12th), direct sowing Cilantro (from May 1st to May 29th), and direct sowing Moss Rose (from May 22nd to June 5th).