Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Sumner, WA, based on the USDA Hardiness Zone 8b.
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Sumner, WA Frost Dates & Growing Season
Last Spring Frost Date for Sumner, WA
The average last frost date in spring for Sumner is April 20th. For gardeners planting sensitive crops like tomatoes, peppers, and basil, it is generally recommended to wait until May 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 Sumner, WA
The average first frost date in fall for Sumner is November 10th. 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 Sumner, WA
Based on historical frost data, the estimated growing season length in Sumner is approximately 204 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.
Sumner, WA Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Sumner, WA Monthly Planting Recommendations
February
In February, recommended activities include starting Statice seeds indoors (from February 23rd to March 9th), starting Stevia seeds indoors (from February 23rd to March 9th), and starting Tomato seeds indoors (from February 23rd to March 9th).
March
In March, recommended activities include direct sowing Parsley (from March 23rd to April 6th), direct sowing California Poppy (from March 23rd to April 6th), and direct sowing Carrot (from March 30th to April 13th).
April
In April, recommended activities include direct sowing Zucchini (from April 27th to May 11th), direct sowing Lemon Balm (from April 20th to May 4th), and direct sowing Fenugreek (from April 20th to May 4th).
May
In May, recommended activities include direct sowing Sesame (from May 4th to May 18th), direct sowing Lima Bean (from May 4th to May 18th), and direct sowing Watermelon (from May 4th to May 18th).