Anton, CO frost dates
Last spring frostMay 12median date
First fall frostOct 4median date
Growing season145 daysfrost-free
Hardiness zone5bZone 5b
How Anton compares
- In 8 years out of 10, the last spring frost in Anton falls between April 30 and May 26, a 26-day window. The first fall frost falls between September 21 and October 16.
- The median last frost is 1 day later than the Colorado median of May 11.
- Its 145-day growing season is longer than 48% of the 374 Colorado places with a regular frost season (state median 146 days).
- The last frost is 11 days later than the zone 5b median of May 1. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5b chart.
- The weather station records an average of 175 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 30 |
| 50% (median) | May 12 |
| 10% (safe for tender plants) | May 26 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 21 |
| 50% (median) | October 4 |
| 90% (late) | October 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 Anton, CO
Anton, CO frost dates — last frost May 12, first frost Oct 4, zone 5b. whenisthelastfrost.com
Crop
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Start indoors: Feb 17 to Mar 3Transplant outside: Apr 14 to Apr 28
Start indoors: Mar 3 to Mar 17Transplant outside: May 26 to Jun 9
Start indoors: Mar 3 to Mar 17Transplant outside: May 26 to Jun 9
Start indoors: Mar 17 to Mar 31Transplant outside: May 19 to Jun 2
Start indoors: Mar 17 to Mar 31Transplant outside: Apr 21 to May 5Sow outdoors: Apr 14 to May 19Plant for fall: Aug 9 to Sep 6
Start indoors: Mar 17 to Mar 31Transplant outside: Apr 14 to Apr 28Sow outdoors: Apr 14 to Apr 28Plant for fall: Jul 26 to Aug 16
Start indoors: Mar 17 to Mar 31Transplant outside: Apr 28 to May 12Plant for fall: Jun 28 to Jul 19
Start indoors: Mar 17 to Mar 31Transplant outside: Apr 21 to May 5Plant for fall: Jun 28 to Jul 19
Start indoors: Mar 17 to Mar 31Transplant outside: Apr 28 to May 12Plant for fall: Jun 28 to Jul 19
Start indoors: Mar 31 to Apr 14Transplant outside: Jun 2 to Jun 16Sow outdoors: Jun 2 to Jun 16
Start indoors: Mar 31 to Apr 14Transplant outside: May 19 to Jun 2
Sow outdoors: Mar 31 to Apr 21Plant for fall: Jul 12 to Aug 2
Sow outdoors: Mar 31 to Apr 21Plant for fall: Aug 9 to Aug 30
Sow outdoors: Apr 7 to May 19Plant for fall: Aug 23 to Sep 13
Start indoors: Apr 14 to Apr 21Transplant outside: May 26 to Jun 2Sow outdoors: May 19 to Jun 2Plant for fall: Jul 19 to Aug 2
Start indoors: Apr 14 to Apr 21Sow outdoors: May 19 to Jun 2Plant for fall: Jul 26 to Aug 9
Start indoors: Apr 14 to Apr 21Sow outdoors: May 19 to Jun 2
Start indoors: Apr 14 to Apr 21Transplant outside: May 26 to Jun 9
Sow outdoors: Apr 21 to May 19Plant for fall: Jul 12 to Jul 26
Sow outdoors: Apr 21 to May 19Plant for fall: Jul 26 to Aug 9
Sow outdoors: Apr 21 to May 12
Sow outdoors: Apr 28 to May 26Plant for fall: Jul 26 to Aug 9
Sow outdoors: Apr 28 to May 19Plant for fall: Aug 9 to Aug 30
Sow outdoors: May 19 to Jun 9Plant for fall: Jul 19 to Aug 2
Sow outdoors: May 19 to Jun 2
Transplant outside: May 26 to Jun 16
Plant for fall: Sep 20 to Oct 25
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Anton, CO
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 17 – Mar 3 | Apr 14 – Apr 28 | — | — |
| Peppers | Mar 3 – Mar 17 | May 26 – Jun 9 | — | — |
| Eggplant | Mar 3 – Mar 17 | May 26 – Jun 9 | — | — |
| Tomatoes | Mar 17 – Mar 31 | May 19 – Jun 2 | — | — |
| Lettuce | Mar 17 – Mar 31 | Apr 21 – May 5 | Apr 14 – May 19 | Aug 9 – Sep 6 |
| Kale | Mar 17 – Mar 31 | Apr 14 – Apr 28 | Apr 14 – Apr 28 | Jul 26 – Aug 16 |
| Broccoli | Mar 17 – Mar 31 | Apr 28 – May 12 | — | Jun 28 – Jul 19 |
| Cabbage | Mar 17 – Mar 31 | Apr 21 – May 5 | — | Jun 28 – Jul 19 |
| Cauliflower | Mar 17 – Mar 31 | Apr 28 – May 12 | — | Jun 28 – Jul 19 |
| Okra | Mar 31 – Apr 14 | Jun 2 – Jun 16 | Jun 2 – Jun 16 | — |
| Basil | Mar 31 – Apr 14 | May 19 – Jun 2 | — | — |
| Peas | — | — | Mar 31 – Apr 21 | Jul 12 – Aug 2 |
| Spinach | — | — | Mar 31 – Apr 21 | Aug 9 – Aug 30 |
| Radishes | — | — | Apr 7 – May 19 | Aug 23 – Sep 13 |
| Cucumbers | Apr 14 – Apr 21 | May 26 – Jun 2 | May 19 – Jun 2 | Jul 19 – Aug 2 |
| Zucchini & Summer Squash | Apr 14 – Apr 21 | — | May 19 – Jun 2 | Jul 26 – Aug 9 |
| Winter Squash & Pumpkins | Apr 14 – Apr 21 | — | May 19 – Jun 2 | — |
| Melons & Watermelon | Apr 14 – Apr 21 | May 26 – Jun 9 | — | — |
| Carrots | — | — | Apr 21 – May 19 | Jul 12 – Jul 26 |
| Beets | — | — | Apr 21 – May 19 | Jul 26 – Aug 9 |
| Potatoes | — | — | Apr 21 – May 12 | — |
| Swiss Chard | — | — | Apr 28 – May 26 | Jul 26 – Aug 9 |
| Cilantro | — | — | Apr 28 – May 19 | Aug 9 – Aug 30 |
| Green Beans | — | — | May 19 – Jun 9 | Jul 19 – Aug 2 |
| Sweet Corn | — | — | May 19 – Jun 2 | — |
| Sweet Potatoes | — | May 26 – Jun 16 | — | — |
| Garlic | — | — | — | Sep 20 – Oct 25 |
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 Shaw 4ene, CO weather station, 19 km away (elevation 5,000 ft (1,524 m)).
Frost dates near Anton
- Cope May 3 · Oct 9
- Lindon May 15 · Oct 2
- Joes May 3 · Oct 9
- Woodrow May 15 · Oct 2
- Flagler May 5 · Oct 8
- Arriba May 5 · Oct 8
- Seibert May 4 · Oct 11
- Genoa May 8 · Oct 10
- Vona May 4 · Oct 11
- Akron May 6 · Oct 8
Frequently asked questions
When is the last frost in Anton, CO?
The median last spring frost in Anton, CO is May 12. There is still about a 10% chance of frost after May 26, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Anton, CO?
The median first fall frost is October 4, with about a 10% chance of frost before September 21.
How long is the growing season in Anton, CO?
About 145 days between the median last spring frost and first fall frost.
What planting zone is Anton, CO?
Anton, CO is in USDA hardiness zone 5b.