Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Riverton, WY, based on the USDA Hardiness Zone 4b.
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Riverton, WY Frost Dates & Growing Season
Last Spring Frost Date for Riverton, WY
The average last frost date in spring for Riverton is May 20th. For gardeners planting sensitive crops like tomatoes, peppers, and basil, it is generally recommended to wait until June 3rd 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 Riverton, WY
The average first frost date in fall for Riverton 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 Riverton, WY
Based on historical frost data, the estimated growing season length in Riverton is approximately 128 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.
Riverton, WY Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Riverton, WY Monthly Planting Recommendations
March
In March, recommended activities include starting French Lavender seeds indoors (from March 11th to March 25th), starting Impatiens seeds indoors (from March 11th to March 25th), and starting Tomatillo seeds indoors (from March 25th to April 8th).
April
In April, recommended activities include direct sowing Parsley (from April 22nd to May 6th), direct sowing Mustard (from April 22nd to May 6th), and direct sowing Spinach (from April 8th to April 22nd).
May
In May, recommended activities include direct sowing Lentil (from May 6th to May 20th), direct sowing Morning Glory (from May 27th to June 10th), and direct sowing Cosmos (from May 27th to June 3rd).
June
In June, recommended activities include direct sowing Corn (from June 3rd to June 10th), direct sowing Melon (from June 3rd to June 17th), and direct sowing Jute (from June 3rd to June 17th).