Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Highland, CA, based on the USDA Hardiness Zone 9b.
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Highland, CA Frost Dates & Growing Season
Last Spring Frost Date for Highland, CA
The average last frost date in spring for Highland is March 15th. For gardeners planting sensitive crops like tomatoes, peppers, and basil, it is generally recommended to wait until March 29th 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 Highland, CA
The average first frost date in fall for Highland is December 1st. 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 Highland, CA
Based on historical frost data, the estimated growing season length in Highland is approximately 261 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.
Highland, CA Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Highland, CA Monthly Planting Recommendations
January
In January, recommended activities include starting Tomatillo seeds indoors (from January 18th to February 1st), starting Rosemary seeds indoors (from January 4th to January 18th), and starting Stevia seeds indoors (from January 18th to February 1st).
February
In February, recommended activities include direct sowing Mustard (from February 15th to March 1st), direct sowing Lettuce (from February 15th to March 1st), and starting Sage seeds indoors (from February 1st to February 15th).
March
In March, recommended activities include direct sowing Mung Bean (from March 29th to April 12th), direct sowing Fennel (from March 1st to March 15th), and direct sowing Zucchini (from March 22nd to April 5th).