Frost dates in San Juan, TX
The average last spring frost in San Juan is around January 21 and the first fall frost is around December 20. That gives San Juan an average growing season of about 334 days.
Last spring frost
| Early (10% chance after) | January 7 |
|---|---|
| Average (50%) | January 21 |
| Late (90%) | February 14 |
First fall frost
| Early (10%) | December 6 |
|---|---|
| Average (50%) | December 20 |
| Late (90% chance before) | December 24 |