Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Roberts, MT, based on the USDA Hardiness Zone 4b.
On this page:
Roberts, MT Frost Dates & Growing Season
Last Spring Frost Date for Roberts, MT
The average last frost date in spring for Roberts is May 25th. For gardeners planting sensitive crops like tomatoes, peppers, and basil, it is generally recommended to wait until June 8th 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 Roberts, MT
The average first frost date in fall for Roberts 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 Roberts, MT
Based on historical frost data, the estimated growing season length in Roberts is approximately 123 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.
Roberts, MT Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Roberts, MT Monthly Planting Recommendations
March
In March, recommended activities include starting Tomatillo seeds indoors (from March 30th to April 13th), starting Coneflower seeds indoors (from March 30th to April 13th), and starting Thyme seeds indoors (from March 30th to April 13th).
April
In April, recommended activities include direct sowing Flax (from April 27th to May 11th), direct sowing Sorrel (from April 27th to May 11th), and starting Sage seeds indoors (from April 13th to April 27th).
May
In May, recommended activities include direct sowing Alyssum (from May 11th to May 25th), direct sowing Lentil (from May 11th to May 25th), and direct sowing Fenugreek (from May 25th to June 8th).
June
In June, recommended activities include direct sowing Chia (from June 8th to June 22nd), direct sowing Corn (from June 8th to June 15th), and direct sowing Lima Bean (from June 8th to June 22nd).