Use this planting calendar to find the best times of the year to grow fruits, vegetables, herbs, flowers, and other popular plants in Janesville, CA, based on the USDA Hardiness Zone 6b.
On this page:
Janesville, CA Frost Dates & Growing Season
Last Spring Frost Date for Janesville, CA
The average last frost date in spring for Janesville is June 8th. For gardeners planting sensitive crops like tomatoes, peppers, and basil, it is generally recommended to wait until June 22nd 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 Janesville, CA
The average first frost date in fall for Janesville is October 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 Janesville, CA
Based on historical frost data, the estimated growing season length in Janesville is approximately 115 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.
Janesville, CA Planting Calendar
This weekly planting calendar displays the ideal windows for starting seeds, transplanting, and harvesting your plants.
Janesville, CA Monthly Planting Recommendations
March
In March, recommended activities include starting Geranium seeds indoors (from March 30th to April 13th), starting Petunia seeds indoors (from March 30th to April 13th), and starting Onion seeds indoors (from March 30th to April 13th).
April
In April, recommended activities include starting Oregano seeds indoors (from April 13th to April 27th), direct sowing Pea (from April 27th to May 11th), and starting Cabbage seeds indoors (from April 13th to April 27th).
May
In May, recommended activities include direct sowing Dill (from May 25th to June 8th), direct sowing Lentil (from May 25th to June 8th), and direct sowing Garden Cress (from May 11th to May 25th).
June
In June, recommended activities include direct sowing Babys Breath (from June 8th to June 22nd), direct sowing Lemon Balm (from June 8th to June 22nd), and direct sowing Cantaloupe (from June 15th to June 29th).