Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Markham, WA, based on the USDA Hardiness Zone 8b.
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Markham, WA Frost Dates & Growing Season
Last Spring Frost Date for Markham, WA
The average last frost date in spring for Markham is May 1st. For gardeners planting sensitive crops like tomatoes, peppers, and basil, it is generally recommended to wait until May 15th 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 Markham, WA
The average first frost date in fall for Markham is October 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 Markham, WA
Based on historical frost data, the estimated growing season length in Markham is approximately 172 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.
Markham, WA Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Markham, WA Monthly Planting Recommendations
February
In February, recommended activities include starting Leek seeds indoors (from February 20th to March 6th), starting French Lavender seeds indoors (from February 20th to March 6th), and starting Celery seeds indoors (from February 20th to March 6th).
March
In March, recommended activities include starting Broccoli seeds indoors (from March 6th to March 20th), starting Thyme seeds indoors (from March 6th to March 20th), and starting Aubergine seeds indoors (from March 6th to March 20th).
April
In April, recommended activities include direct sowing Alyssum (from April 17th to May 1st), direct sowing Potato (from April 3rd to April 17th), and direct sowing California Poppy (from April 3rd to April 17th).
May
In May, recommended activities include direct sowing Butternut Squash (from May 8th to May 22nd), direct sowing Mung Bean (from May 15th to May 29th), and direct sowing Okra (from May 15th to May 29th).