Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Marble, CO, based on the USDA Hardiness Zone 5a.
On this page:
Marble, CO Frost Dates & Growing Season
Last Spring Frost Date for Marble, CO
The average last frost date in spring for Marble 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 Marble, CO
The average first frost date in fall for Marble is September 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 Marble, CO
Based on historical frost data, the estimated growing season length in Marble is approximately 82 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.
Marble, CO Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Marble, CO Monthly Planting Recommendations
April
In April, recommended activities include starting Coleus seeds indoors (from April 30th to May 14th), starting Snapdragon seeds indoors (from April 16th to April 30th), and starting Pansy seeds indoors (from April 16th to April 30th).
May
In May, recommended activities include direct sowing Garden Cress (from May 28th to June 11th), starting Sage seeds indoors (from May 14th to May 28th), and direct sowing Poppy (from May 28th to June 11th).
June
In June, recommended activities include direct sowing Alyssum (from June 11th to June 25th), direct sowing German Chamomile (from June 11th to June 25th), and direct sowing Lemon Balm (from June 25th to July 9th).
July
In July, recommended activities include direct sowing Zucchini (from July 2nd to July 16th), direct sowing Runner Bean (from July 2nd to July 16th), and direct sowing Cucumber (from July 2nd to July 16th).