Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Mammoth, WY, based on the USDA Hardiness Zone 4b.
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Mammoth, WY Frost Dates & Growing Season
Last Spring Frost Date for Mammoth, WY
The average last frost date in spring for Mammoth is June 25th. For gardeners planting sensitive crops like tomatoes, peppers, and basil, it is generally recommended to wait until July 9th 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 Mammoth, WY
The average first frost date in fall for Mammoth is September 1st. 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 Mammoth, WY
Based on historical frost data, the estimated growing season length in Mammoth is approximately 68 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.
Mammoth, WY Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Mammoth, WY Monthly Planting Recommendations
April
In April, recommended activities include starting Coleus seeds indoors (from April 30th to May 14th).
May
In May, recommended activities include starting Kale seeds indoors (from May 14th to May 28th), direct sowing Kale (from May 28th to June 11th), direct sowing Watercress (from May 28th to June 11th), and direct sowing Chervil (from May 28th to June 11th).
June
In June, recommended activities include direct sowing Fenugreek (from June 25th to July 9th), direct sowing Cilantro (from June 11th to July 9th), and direct sowing Calendula (from June 11th to June 25th).
July
In July, recommended activities include direct sowing Cucumber (from July 2nd to July 16th), direct sowing Okra (from July 9th to July 23rd), and direct sowing Zucchini (from July 2nd to July 16th).