Last frost date in Commerce City, CO
In Commerce City, the last spring frost comes around May 3 in an average year. Wait until May 16 if you want 90% odds of no more frost. The first fall frost usually arrives about October 7, which leaves 155 frost-free days. An early freeze before September 26 happens one year in ten.
- Safe after (10% risk)
- May 16
- Average first frost
- Oct 7
- Frost-free season
- 155 days
- Hard freeze (28°F) ends
- Apr 23
Frost possible in low spots Mon night, low 36°F
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2256°
- FriOct 2347°
- SatOct 2439°
- SunOct 2538°
- MonOct 2636°possible frost
- TueOct 2737°
- WedOct 2839°
Planting calendar for Commerce City
Windows count forward or back from the average frost dates above. Click a crop for dates across Colorado.
TomatoesMay 10–May 24
PumpkinsMay 17–May 31
SunflowersMay 3–May 24
CucumbersMay 17–May 24
CornMay 10–May 24
Sweet potatoesMay 24–Jun 7
WatermelonMay 17–May 31
Green beansMay 10–May 31
ZucchiniMay 10–May 24
OkraMay 24–Jun 7
PeppersMay 17–May 31
BasilMay 10–May 24
Butternut squashMay 10–May 24
CantaloupeMay 17–May 31
EggplantMay 17–May 31
PotatoesApr 5–Apr 19
OnionsMar 22–Apr 12
CarrotsApr 12–May 17
LettuceApr 19–May 10
BroccoliApr 5–Apr 19
BeetsApr 5–May 17
PeasMar 22–Apr 5
CabbageApr 5–Apr 19
RadishesMar 29–May 10
Brussels sproutsApr 19–May 3
SpinachMar 22–Apr 12
CilantroApr 19–May 10
KaleApr 5–Apr 19
Collard greensApr 5–Apr 19
TurnipsApr 5–Apr 19
DillMay 3–May 17
CeleryMay 10–May 17
CauliflowerApr 19–May 3
LeeksApr 19–May 3
Swiss chardApr 19–May 17
ParsleyApr 19–May 10
Tulip bulbsSep 23–Oct 28
GarlicSep 16–Oct 21
Daffodil bulbsSep 9–Oct 21
StrawberriesApr 5–Apr 19
AsparagusApr 5–Apr 19Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Apr 22 | May 3 | May 16 | Sep 26 | Oct 7 | Oct 19 |
| Hard freeze, 28°F | Apr 8 | Apr 23 | May 7 | Oct 4 | Oct 16 | Oct 29 |
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 Brighton 3 SE (USC00050950) sits 4.7 miles from the center of Commerce City at 5,016 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 Commerce City, CO?
The average last frost date in Commerce City is May 3, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 16.
When is the first frost in Commerce City?
The first frost in fall usually comes around October 7. One year in ten it arrives before September 26.
How long is the growing season in Commerce City?
About 155 days between the average last and first frost.
When should I plant tomatoes in Commerce City?
Plant tomato seedlings outside from May 10 to May 24. Start seeds indoors six to eight weeks earlier.
Nearby in Colorado
- BrightonMay 3
- ThorntonMay 2
- DenverMay 4
- NorthglennMay 2
- AuroraMay 7
- WestminsterMay 2
- BroomfieldMay 2
- Four Square MileMay 7
- ErieMay 7
- LafayetteMay 2
- Wheat RidgeMay 5
- ArvadaMay 5