Last frost date in Denison, TX
The average last frost in Denison is March 14. By April 1 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about November 19, which leaves 250 frost-free days. An early freeze before November 2 happens one year in ten.
- Safe after (10% risk)
- Apr 1
- Average first frost
- Nov 19
- Frost-free season
- 250 days
- Hard freeze (28°F) ends
- Mar 2
No frost in the next 7 nights
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2256°
- FriOct 2357°
- SatOct 2459°
- SunOct 2556°
- MonOct 2656°
- TueOct 2755°
- WedOct 2856°
Planting calendar for Denison
Windows count forward or back from the average frost dates above. Click a crop for dates across Texas.
TomatoesMar 21–Apr 4
PumpkinsMar 28–Apr 11
SunflowersMar 14–Apr 4
CucumbersMar 28–Apr 4
CornMar 21–Apr 4
Sweet potatoesApr 4–Apr 18
WatermelonMar 28–Apr 11
Green beansMar 21–Apr 11
ZucchiniMar 21–Apr 4
OkraApr 4–Apr 18
PeppersMar 28–Apr 11
BasilMar 21–Apr 4
Butternut squashMar 21–Apr 4
CantaloupeMar 28–Apr 11
EggplantMar 28–Apr 11
PotatoesFeb 14–Feb 28
OnionsJan 31–Feb 21
CarrotsFeb 21–Mar 28
LettuceFeb 28–Mar 21
BroccoliFeb 14–Feb 28
BeetsFeb 14–Mar 28
PeasJan 31–Feb 14
CabbageFeb 14–Feb 28
RadishesFeb 7–Mar 21
Brussels sproutsFeb 28–Mar 14
SpinachJan 31–Feb 21
CilantroFeb 28–Mar 21
KaleFeb 14–Feb 28
Collard greensFeb 14–Feb 28
TurnipsFeb 14–Feb 28
DillMar 14–Mar 28
CeleryMar 21–Mar 28
CauliflowerFeb 28–Mar 14
LeeksFeb 28–Mar 14
Swiss chardFeb 28–Mar 28
ParsleyFeb 28–Mar 21
Tulip bulbsNov 5–Dec 10
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
StrawberriesFeb 14–Feb 28
AsparagusFeb 14–Feb 28Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Feb 25 | Mar 14 | Apr 1 | Nov 2 | Nov 19 | Dec 6 |
| Hard freeze, 28°F | Feb 10 | Mar 2 | Mar 21 | Nov 11 | Nov 30 | Dec 20 |
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 Sherman (USC00418274) sits 5.6 miles from the center of Denison at 760 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 Denison, TX?
The average last frost date in Denison is March 14, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 1.
When is the first frost in Denison?
The first frost in fall usually comes around November 19. One year in ten it arrives before November 2.
How long is the growing season in Denison?
About 250 days between the average last and first frost.
When should I plant tomatoes in Denison?
Plant tomato seedlings outside from March 21 to April 4. Start seeds indoors six to eight weeks earlier.