Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Silverthorne, CO, based on the USDA Hardiness Zone 4b.
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Silverthorne, CO Frost Dates & Growing Season
Last Spring Frost Date for Silverthorne, CO
The average last frost date in spring for Silverthorne is June 18th. For gardeners planting sensitive crops like tomatoes, peppers, and basil, it is generally recommended to wait until July 2nd 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 Silverthorne, CO
The average first frost date in fall for Silverthorne 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 Silverthorne, CO
Based on historical frost data, the estimated growing season length in Silverthorne is approximately 75 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.
Silverthorne, CO Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Silverthorne, CO Monthly Planting Recommendations
April
In April, recommended activities include starting Pepper seeds indoors (from April 23rd to May 7th), starting Ground Cherry seeds indoors (from April 23rd to May 7th), and starting Coleus seeds indoors (from April 23rd to May 7th).
May
In May, recommended activities include direct sowing Bok Choy (from May 21st to June 4th), direct sowing Poppy (from May 21st to June 4th), and direct sowing Garden Cress (from May 21st to June 4th).
June
In June, recommended activities include direct sowing Beet (from June 4th to June 18th), direct sowing Swiss Chard (from June 4th to June 18th), and direct sowing Calendula (from June 4th to June 18th).
July
In July, recommended activities include direct sowing Okra (from July 2nd to July 16th).