Santa Clarita, CA Frost Dates
Published: February 1, 2026 · Updated: April 23, 2026
USDA Zone 7b
Last Spring Frost
March 1
Safe to transplant after this date
First Fall Frost
November 22
Protect tender plants before this date
Frost-Free Season
266 days
Early March to Early December
274 days until last frost in Santa Clarita — March 1
Santa Clarita’s zone 7b climate provides a generous 266-day frost-free window — long enough for a wide variety of vegetables and excellent conditions for both cool-season and warm-season lawn grasses.
Complete Planting Calendar for Santa Clarita
Lawn Care Timing for Santa Clarita
Based on Santa Clarita's USDA zone 7b frost dates: The last frost of March 1 marks when warm-season grasses begin recovering. Apply spring fertilizer in Early March when soil reaches 55°F. The first fall frost of November 22 sets your deadlines — complete overseeding by October 1–November 1 and apply winterizer by Early December.
USDA Zone 7b Summary
Almost 9 months frost-free. Warm-season grasses thrive. Brief winter dormancy only.
Frequently Asked Questions
What is the last frost date in Santa Clarita, CA?
The average last spring frost in Santa Clarita is March 1. This is based on USDA zone 7b historical averages. Plan transplanting and spring lawn care around this date — wait 2 weeks after for frost-sensitive plantings.
When is the first fall frost in Santa Clarita?
Santa Clarita’s average first fall frost is November 22. This sets deadlines for fall overseeding (must be done 6 weeks before) and winterizer application (by Early December).
When should I plant tomatoes in Santa Clarita?
Transplant tomato seedlings outdoors after March 1. Start seeds indoors Early December. Direct sow warm-season crops after march 10.
When should I overseed my lawn in Santa Clarita?
The prime overseeding window in Santa Clarita is October 1–November 1. This ensures warm soil for germination before the first fall frost on November 22.
When should I apply winterizer in Santa Clarita?
Apply winterizer fertilizer in Santa Clarita by Early December. This high-potassium application hardens grass cell walls before freeze damage. Your first fall frost of November 22 is the hard deadline.