Last frost date in Grand Junction, CO
In Grand Junction, the last spring frost comes around April 14 in an average year. Wait until April 28 if you want 90% odds of no more frost. The first fall frost usually arrives about October 23, which leaves 190 frost-free days. An early freeze before October 11 happens one year in ten.
- Safe after (10% risk)
- Apr 28
- Average first frost
- Oct 23
- Frost-free season
- 190 days
- Hard freeze (28°F) ends
- Apr 2
No frost in the next 7 nights
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2252°
- FriOct 2344°
- SatOct 2444°
- SunOct 2542°
- MonOct 2641°
- TueOct 2741°
- WedOct 2842°
Planting calendar for Grand Junction
Windows count forward or back from the average frost dates above. Click a crop for dates across Colorado.
TomatoesApr 21–May 5
PumpkinsApr 28–May 12
SunflowersApr 14–May 5
CucumbersApr 28–May 5
CornApr 21–May 5
Sweet potatoesMay 5–May 19
WatermelonApr 28–May 12
Green beansApr 21–May 12
ZucchiniApr 21–May 5
OkraMay 5–May 19
PeppersApr 28–May 12
BasilApr 21–May 5
Butternut squashApr 21–May 5
CantaloupeApr 28–May 12
EggplantApr 28–May 12
PotatoesMar 17–Mar 31
OnionsMar 3–Mar 24
CarrotsMar 24–Apr 28
LettuceMar 31–Apr 21
BroccoliMar 17–Mar 31
BeetsMar 17–Apr 28
PeasMar 3–Mar 17
CabbageMar 17–Mar 31
RadishesMar 10–Apr 21
Brussels sproutsMar 31–Apr 14
SpinachMar 3–Mar 24
CilantroMar 31–Apr 21
KaleMar 17–Mar 31
Collard greensMar 17–Mar 31
TurnipsMar 17–Mar 31
DillApr 14–Apr 28
CeleryApr 21–Apr 28
CauliflowerMar 31–Apr 14
LeeksMar 31–Apr 14
Swiss chardMar 31–Apr 28
ParsleyMar 31–Apr 21
Tulip bulbsOct 9–Nov 13
GarlicOct 2–Nov 6
Daffodil bulbsSep 25–Nov 6
StrawberriesMar 17–Mar 31
AsparagusMar 17–Mar 31Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Apr 1 | Apr 14 | Apr 28 | Oct 11 | Oct 23 | Nov 6 |
| Hard freeze, 28°F | Mar 12 | Apr 2 | Apr 18 | Oct 19 | Nov 2 | Nov 15 |
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 Grand Junction Wfo (USC00053486) sits 3.1 miles from the center of Grand Junction at 4,826 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 Grand Junction, CO?
The average last frost date in Grand Junction is April 14, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 28.
When is the first frost in Grand Junction?
The first frost in fall usually comes around October 23. One year in ten it arrives before October 11.
How long is the growing season in Grand Junction?
About 190 days between the average last and first frost.
When should I plant tomatoes in Grand Junction?
Plant tomato seedlings outside from April 21 to May 5. Start seeds indoors six to eight weeks earlier.
Nearby in Colorado
- MontroseApr 28
- BoulderMay 6
- LakewoodMay 3
- ArvadaMay 5
- Wheat RidgeMay 5
- LouisvilleMay 6
- LittletonMay 2
- EnglewoodMay 2
- WestminsterMay 2
- LafayetteMay 2
- BroomfieldMay 2
- LongmontMay 7