Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Castle rock, WA, based on the USDA Hardiness Zone 8b.
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Castle rock, WA Frost Dates & Growing Season
Last Spring Frost Date for Castle rock, WA
The average last frost date in spring for Castle rock is April 25th. For gardeners planting sensitive crops like tomatoes, peppers, and basil, it is generally recommended to wait until May 9th 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 Castle rock, WA
The average first frost date in fall for Castle rock is October 15th. 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 Castle rock, WA
Based on historical frost data, the estimated growing season length in Castle rock is approximately 173 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.
Castle rock, WA Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Castle rock, WA Monthly Planting Recommendations
February
In February, recommended activities include starting Impatiens seeds indoors (from February 14th to February 28th), starting Tomatillo seeds indoors (from February 28th to March 14th), and starting Cabbage seeds indoors (from February 28th to March 14th).
March
In March, recommended activities include direct sowing California Poppy (from March 28th to April 11th), starting Cantaloupe seeds indoors (from March 28th to April 11th), and direct sowing Poppy (from March 28th to April 11th).
April
In April, recommended activities include direct sowing Babys Breath (from April 25th to May 9th), direct sowing Fenugreek (from April 25th to May 9th), and direct sowing Beet (from April 11th to April 25th).
May
In May, recommended activities include direct sowing Sunflower (from May 2nd to May 16th), direct sowing Cucumber (from May 2nd to May 16th), and direct sowing Butterfly Pea (from May 9th to May 23rd).