Kremmling, CO frost dates
Last spring frostJun 14median date
First fall frostSep 5median date
Growing season83 daysfrost-free
Hardiness zone5aZone 5a
How Kremmling compares
- In 8 years out of 10, the last spring frost in Kremmling falls between June 1 and June 30, a 29-day window. The first fall frost falls between August 26 and September 16.
- The median last frost is 34 days later than the Colorado median of May 11.
- Its 83-day growing season is longer than 4% of the 374 Colorado places with a regular frost season (state median 146 days).
- The last frost is 42 days later than the zone 5a median of May 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5a chart.
- The weather station records an average of 235 nights a year at or below 32°F.
- Compared with Boulder, CO, 93 km away, the last frost here is 39 days later than there and the growing season is 69 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | June 1 |
| 50% (median) | June 14 |
| 10% (safe for tender plants) | June 30 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 26 |
| 50% (median) | September 5 |
| 90% (late) | September 16 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Kremmling, CO
Kremmling, CO frost dates — last frost Jun 14, first frost Sep 5, zone 5a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 22 to Apr 5Transplant outside: May 17 to May 31
Start indoors: Apr 5 to Apr 19Transplant outside: Jun 28 to Jul 12
Start indoors: Apr 5 to Apr 19Transplant outside: Jun 28 to Jul 12
Start indoors: Apr 19 to May 3Transplant outside: Jun 21 to Jul 5
Start indoors: Apr 19 to May 3Transplant outside: May 24 to Jun 7Sow outdoors: May 17 to Jun 21Plant for fall: Jul 11 to Aug 8
Start indoors: Apr 19 to May 3Transplant outside: May 17 to May 31Sow outdoors: May 17 to May 31
Start indoors: Apr 19 to May 3Transplant outside: May 31 to Jun 14
Start indoors: Apr 19 to May 3Transplant outside: May 24 to Jun 7
Start indoors: Apr 19 to May 3Transplant outside: May 31 to Jun 14
Start indoors: May 3 to May 17Transplant outside: Jul 5 to Jul 19Sow outdoors: Jul 5 to Jul 19
Start indoors: May 3 to May 17Transplant outside: Jun 21 to Jul 5
Sow outdoors: May 3 to May 24
Sow outdoors: May 3 to May 24Plant for fall: Jul 11 to Aug 1
Sow outdoors: May 10 to Jun 21Plant for fall: Jul 25 to Aug 15
Start indoors: May 17 to May 24Transplant outside: Jun 28 to Jul 5Sow outdoors: Jun 21 to Jul 5
Start indoors: May 17 to May 24Sow outdoors: Jun 21 to Jul 5
Start indoors: May 17 to May 24Sow outdoors: Jun 21 to Jul 5
Start indoors: May 17 to May 24Transplant outside: Jun 28 to Jul 12
Sow outdoors: May 24 to Jun 21
Sow outdoors: May 24 to Jun 21
Sow outdoors: May 24 to Jun 14
Sow outdoors: May 31 to Jun 28
Sow outdoors: May 31 to Jun 21Plant for fall: Jul 11 to Aug 1
Sow outdoors: Jun 21 to Jul 12
Sow outdoors: Jun 21 to Jul 5
Transplant outside: Jun 28 to Jul 19
Plant for fall: Aug 22 to Sep 26
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Kremmling, CO
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 22 – Apr 5 | May 17 – May 31 | — | — |
| Peppers Warning: Your frost-free season is about 83 days, which is tight for peppers (75+ days). Choose early varieties and use transplants or row covers. | Apr 5 – Apr 19 | Jun 28 – Jul 12 | — | — |
| Eggplant Warning: Your frost-free season is about 83 days, which is tight for eggplant (75+ days). Choose early varieties and use transplants or row covers. | Apr 5 – Apr 19 | Jun 28 – Jul 12 | — | — |
| Tomatoes Warning: Your frost-free season is about 83 days, which is tight for tomatoes (70+ days). Choose early varieties and use transplants or row covers. | Apr 19 – May 3 | Jun 21 – Jul 5 | — | — |
| Lettuce | Apr 19 – May 3 | May 24 – Jun 7 | May 17 – Jun 21 | Jul 11 – Aug 8 |
| Kale | Apr 19 – May 3 | May 17 – May 31 | May 17 – May 31 | — |
| Broccoli | Apr 19 – May 3 | May 31 – Jun 14 | — | — |
| Cabbage | Apr 19 – May 3 | May 24 – Jun 7 | — | — |
| Cauliflower | Apr 19 – May 3 | May 31 – Jun 14 | — | — |
| Okra | May 3 – May 17 | Jul 5 – Jul 19 | Jul 5 – Jul 19 | — |
| Basil | May 3 – May 17 | Jun 21 – Jul 5 | — | — |
| Peas | — | — | May 3 – May 24 | — |
| Spinach | — | — | May 3 – May 24 | Jul 11 – Aug 1 |
| Radishes | — | — | May 10 – Jun 21 | Jul 25 – Aug 15 |
| Cucumbers | May 17 – May 24 | Jun 28 – Jul 5 | Jun 21 – Jul 5 | — |
| Zucchini & Summer Squash | May 17 – May 24 | — | Jun 21 – Jul 5 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 83 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 17 – May 24 | — | Jun 21 – Jul 5 | — |
| Melons & Watermelon Warning: Your frost-free season is about 83 days, which is tight for melons & watermelon (85+ days). Choose early varieties and use transplants or row covers. | May 17 – May 24 | Jun 28 – Jul 12 | — | — |
| Carrots | — | — | May 24 – Jun 21 | — |
| Beets | — | — | May 24 – Jun 21 | — |
| Potatoes | — | — | May 24 – Jun 14 | — |
| Swiss Chard | — | — | May 31 – Jun 28 | — |
| Cilantro | — | — | May 31 – Jun 21 | Jul 11 – Aug 1 |
| Green Beans | — | — | Jun 21 – Jul 12 | — |
| Sweet Corn Warning: Your frost-free season is about 83 days, which is tight for sweet corn (80+ days). Choose early varieties and use transplants or row covers. | — | — | Jun 21 – Jul 5 | — |
| Sweet Potatoes Warning: Your frost-free season is about 83 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 28 – Jul 19 | — | — |
| Garlic | — | — | — | Aug 22 – Sep 26 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Kremmling, CO weather station, 2 km away (elevation 7,461 ft (2,274 m)).
Frost dates near Kremmling
- Hot Sulphur Springs Jun 12 · Sep 10
- Parshall Jun 12 · Sep 10
- Bond Jun 6 · Sep 14
- Mc Coy Jun 14 · Sep 11
- Toponas Jun 14 · Sep 11
- Granby Jun 13 · Sep 7
- Silverthorne frost any month
- Yampa Jun 14 · Sep 11
- Tabernash frost any month
- Wolcott Jun 21 · Sep 7
Frequently asked questions
When is the last frost in Kremmling, CO?
The median last spring frost in Kremmling, CO is June 14. There is still about a 10% chance of frost after June 30, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Kremmling, CO?
The median first fall frost is September 5, with about a 10% chance of frost before August 26.
How long is the growing season in Kremmling, CO?
About 83 days between the median last spring frost and first fall frost.
What planting zone is Kremmling, CO?
Kremmling, CO is in USDA hardiness zone 5a.