San Antonio, TX Frost Dates
Published: February 1, 2026 · Updated: April 23, 2026
USDA Zone 8b
Last Spring Frost
February 1
Safe to transplant after this date
First Fall Frost
December 15
Protect tender plants before this date
Frost-Free Season
317 days
February to December
247 days until last frost in San Antonio — February 1
San Antonio’s zone 8b climate means frost is a minor consideration. Ten and a half months frost-free. Most warm-season grasses stay green almost year-round. Rather than a single planting season, San Antonio gardeners work almost year-round.
Complete Planting Calendar for San Antonio
Lawn Care Timing for San Antonio
Based on San Antonio's USDA zone 8b frost dates: The last frost of February 1 marks when warm-season grasses begin recovering. Apply spring fertilizer in February when soil reaches 55°F. The first fall frost of December 15 sets your deadlines — complete overseeding by November 1–December 1 and apply winterizer by Late December.
USDA Zone 8b Summary
Ten and a half months frost-free. Most warm-season grasses stay green almost year-round.
Frequently Asked Questions
What is the last frost date in San Antonio, TX?
The average last spring frost in San Antonio is February 1. This is based on USDA zone 8b 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 San Antonio?
San Antonio’s average first fall frost is December 15. This sets deadlines for fall overseeding (must be done when temperatures cool) and winterizer application (by Late December).
When should I plant tomatoes in San Antonio?
Transplant tomato seedlings outdoors after February 1. Start seeds indoors October (for winter garden). Direct sow warm-season crops after february 8.
When should I overseed my lawn in San Antonio?
The prime overseeding window in San Antonio is November 1–December 1. This ensures warm soil for germination before the first fall frost on December 15.
When should I apply winterizer in San Antonio?
Apply winterizer fertilizer in San Antonio by Late December. This high-potassium application hardens grass cell walls before freeze damage. Your first fall frost of December 15 is the hard deadline.