Last frost date in Greeley, CO
In Greeley, the last spring frost comes around May 2 in an average year. Wait until May 14 if you want 90% odds of no more frost. The first fall frost usually arrives about October 8, which leaves 159 frost-free days. An early freeze before September 26 happens one year in ten.
- Safe after (10% risk)
- May 14
- Average first frost
- Oct 8
- Frost-free season
- 159 days
- Hard freeze (28°F) ends
- Apr 20
Frost possible in low spots Mon night, low 34°F
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2252°
- FriOct 2346°
- SatOct 2439°
- SunOct 2538°
- MonOct 2634°possible frost
- TueOct 2735°possible frost
- WedOct 2837°
Planting calendar for Greeley
Windows count forward or back from the average frost dates above. Click a crop for dates across Colorado.
TomatoesMay 9–May 23
PumpkinsMay 16–May 30
SunflowersMay 2–May 23
CucumbersMay 16–May 23
CornMay 9–May 23
Sweet potatoesMay 23–Jun 6
WatermelonMay 16–May 30
Green beansMay 9–May 30
ZucchiniMay 9–May 23
OkraMay 23–Jun 6
PeppersMay 16–May 30
BasilMay 9–May 23
Butternut squashMay 9–May 23
CantaloupeMay 16–May 30
EggplantMay 16–May 30
PotatoesApr 4–Apr 18
OnionsMar 21–Apr 11
CarrotsApr 11–May 16
LettuceApr 18–May 9
BroccoliApr 4–Apr 18
BeetsApr 4–May 16
PeasMar 21–Apr 4
CabbageApr 4–Apr 18
RadishesMar 28–May 9
Brussels sproutsApr 18–May 2
SpinachMar 21–Apr 11
CilantroApr 18–May 9
KaleApr 4–Apr 18
Collard greensApr 4–Apr 18
TurnipsApr 4–Apr 18
DillMay 2–May 16
CeleryMay 9–May 16
CauliflowerApr 18–May 2
LeeksApr 18–May 2
Swiss chardApr 18–May 16
ParsleyApr 18–May 9
Tulip bulbsSep 24–Oct 29
GarlicSep 17–Oct 22
Daffodil bulbsSep 10–Oct 22
StrawberriesApr 4–Apr 18
AsparagusApr 4–Apr 18Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Apr 17 | May 2 | May 14 | Sep 26 | Oct 8 | Oct 21 |
| Hard freeze, 28°F | Apr 5 | Apr 20 | May 5 | Oct 4 | Oct 18 | Nov 1 |
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 Greeley Unc (USC00053553) sits 3.9 miles from the center of Greeley at 4,715 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 Greeley, CO?
The average last frost date in Greeley is May 2, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 14.
When is the first frost in Greeley?
The first frost in fall usually comes around October 8. One year in ten it arrives before September 26.
How long is the growing season in Greeley?
About 159 days between the average last and first frost.
When should I plant tomatoes in Greeley?
Plant tomato seedlings outside from May 9 to May 23. Start seeds indoors six to eight weeks earlier.