Last frost date in San Juan, TX
The average last frost in San Juan is January 9. By February 12 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about January 1, which leaves 365 frost-free days. An early freeze before December 8 happens one year in ten.
- Safe after (10% risk)
- Feb 12
- Average first frost
- Jan 1
- Frost-free season
- 365 days
- Hard freeze (28°F) ends
- Jan 4
No frost in the next 7 nights
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2266°
- FriOct 2368°
- SatOct 2470°
- SunOct 2567°
- MonOct 2668°
- TueOct 2767°
- WedOct 2866°
Planting calendar for San Juan
Windows count forward or back from the average frost dates above. Click a crop for dates across Texas.
TomatoesFeb 15–Mar 1
PumpkinsFeb 15–Mar 1
SunflowersFeb 15–Mar 8
CucumbersFeb 22–Mar 1
CornFeb 15–Mar 1
Sweet potatoesFeb 15–Mar 1
WatermelonFeb 15–Mar 1
Green beansFeb 15–Mar 8
ZucchiniFeb 15–Mar 1
OkraFeb 15–Mar 1
PeppersFeb 15–Mar 1
BasilFeb 15–Mar 1
Butternut squashFeb 15–Mar 1
CantaloupeFeb 15–Mar 1
EggplantFeb 15–Mar 1
PotatoesDec 12–Dec 26
OnionsNov 28–Dec 19
CarrotsDec 19–Jan 23
LettuceDec 26–Jan 16
BroccoliDec 12–Dec 26
BeetsDec 12–Jan 23
PeasNov 28–Dec 12
CabbageDec 12–Dec 26
RadishesDec 5–Jan 16
Brussels sproutsDec 26–Jan 9
SpinachNov 28–Dec 19
CilantroDec 26–Jan 16
KaleDec 12–Dec 26
Collard greensDec 12–Dec 26
TurnipsDec 12–Dec 26
DillJan 9–Jan 23
CeleryJan 16–Jan 23
CauliflowerDec 26–Jan 9
LeeksDec 26–Jan 9
Swiss chardDec 26–Jan 23
ParsleyDec 26–Jan 16
Tulip bulbsDec 15–Jan 15
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
StrawberriesDec 12–Dec 26
AsparagusDec 12–Dec 26Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Dec 14 | Jan 9 | Feb 12 | Dec 8 | Jan 1 | Feb 4 |
| Hard freeze, 28°F | Dec 15 | Jan 4 | Feb 9 | Dec 14 | Jan 2 | Feb 6 |
Read the spring 10% column as the date after which only one year in ten still gets frost. That is the safer date for tomatoes, peppers and basil.
Where these numbers come from
NOAA station Mcallen (USC00415701) sits 6.2 miles from the center of San Juan at 100 feet. Its averages cover 1991 to 2020. Low spots, valleys and open fields can keep getting frost a week or two after the station stops; city centers and lakeshores usually get less of it.
Questions
When is the last frost in San Juan, TX?
The average last frost date in San Juan is January 9, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after February 12.
When is the first frost in San Juan?
The first frost in fall usually comes around January 1. One year in ten it arrives before December 8.
How long is the growing season in San Juan?
About 365 days between the average last and first frost.
When should I plant tomatoes in San Juan?
Plant tomato seedlings outside from February 15 to March 1. Start seeds indoors six to eight weeks earlier.
Nearby in Texas
- AlamoJan 9
- PharrJan 9
- McAllenJan 9
- EdinburgJan 8
- WeslacoJan 8
- MissionJan 9
- AltonJan 23
- HarlingenJan 9
- San BenitoJan 9
- BrownsvilleJan 9
- KingsvilleJan 25
- Corpus ChristiJan 22