Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Colstrip, MT, based on the USDA Hardiness Zone 4b.
On this page:
Colstrip, MT Frost Dates & Growing Season
Last Spring Frost Date for Colstrip, MT
The average last frost date in spring for Colstrip is May 18th. For gardeners planting sensitive crops like tomatoes, peppers, and basil, it is generally recommended to wait until June 1st 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 Colstrip, MT
The average first frost date in fall for Colstrip is October 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 Colstrip, MT
Based on historical frost data, the estimated growing season length in Colstrip is approximately 136 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.
Colstrip, MT Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Colstrip, MT Monthly Planting Recommendations
March
In March, recommended activities include starting Tomatillo seeds indoors (from March 23rd to April 6th), starting Statice seeds indoors (from March 23rd to April 6th), and starting Tomato seeds indoors (from March 23rd to April 6th).
April
In April, recommended activities include direct sowing California Poppy (from April 20th to May 4th), direct sowing Chervil (from April 20th to May 4th), and direct sowing Garden Cress (from April 20th to May 4th).
May
In May, recommended activities include direct sowing Anise (from May 25th to June 1st), direct sowing Beet (from May 4th to May 18th), and direct sowing Morning Glory (from May 25th to June 8th).
June
In June, recommended activities include direct sowing Okra (from June 1st to June 15th), direct sowing Melon (from June 1st to June 15th), and direct sowing Sesame (from June 1st to June 15th).