Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Firth, ID, based on the USDA Hardiness Zone 5b.
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Firth, ID Frost Dates & Growing Season
Last Spring Frost Date for Firth, ID
The average last frost date in spring for Firth is May 21st. For gardeners planting sensitive crops like tomatoes, peppers, and basil, it is generally recommended to wait until June 4th 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 Firth, ID
The average first frost date in fall for Firth is September 20th. 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 Firth, ID
Based on historical frost data, the estimated growing season length in Firth is approximately 122 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.
Firth, ID Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Firth, ID Monthly Planting Recommendations
March
In March, recommended activities include starting Leek seeds indoors (from March 12th to March 26th), starting Ground Cherry seeds indoors (from March 26th to April 9th), and starting Onion seeds indoors (from March 12th to March 26th).
April
In April, recommended activities include starting Pumpkin seeds indoors (from April 30th to May 7th), direct sowing Spinach (from April 9th to April 23rd), and starting Basil seeds indoors (from April 9th to April 23rd).
May
In May, recommended activities include direct sowing Nasturtium (from May 28th to June 4th), direct sowing Fennel (from May 7th to May 21st), and direct sowing Butternut Squash (from May 28th to June 11th).
June
In June, recommended activities include direct sowing Melon (from June 4th to June 18th), direct sowing Mung Bean (from June 4th to June 18th), and direct sowing Corn (from June 4th to June 11th).