Frost dates for 80439 — Evergreen, CO
Last spring frostMay 23median date
First fall frostSep 22median date
Growing season122 daysfrost-free
Hardiness zone5bZone 5b
How Evergreen compares
- In 8 years out of 10, the last spring frost in Evergreen falls between May 9 and June 10, a 32-day window. The first fall frost falls between September 6 and October 3.
- The median last frost is 12 days later than the Colorado median of May 11.
- Its 122-day growing season is longer than 29% of the 374 Colorado places with a regular frost season (state median 146 days).
- The last frost is 22 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 215 nights a year at or below 32°F.
- Compared with Arvada, CO, 29 km away, the last frost here is 18 days later than there and the growing season is 31 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 9 |
| 50% (median) | May 23 |
| 10% (safe for tender plants) | June 10 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 6 |
| 50% (median) | September 22 |
| 90% (late) | October 3 |
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 Evergreen, CO
Frost dates for 80439 — Evergreen, CO — last frost May 23, first frost Sep 22, zone 5b. whenisthelastfrost.com
Crop
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Start indoors: Feb 28 to Mar 14Transplant outside: Apr 25 to May 9
Start indoors: Mar 14 to Mar 28Transplant outside: Jun 6 to Jun 20
Start indoors: Mar 14 to Mar 28Transplant outside: Jun 6 to Jun 20
Start indoors: Mar 28 to Apr 11Transplant outside: May 30 to Jun 13
Start indoors: Mar 28 to Apr 11Transplant outside: May 2 to May 16Sow outdoors: Apr 25 to May 30Plant for fall: Jul 28 to Aug 25
Start indoors: Mar 28 to Apr 11Transplant outside: Apr 25 to May 9Sow outdoors: Apr 25 to May 9Plant for fall: Jul 14 to Aug 4
Start indoors: Mar 28 to Apr 11Transplant outside: May 9 to May 23Plant for fall: Jun 16 to Jul 7
Start indoors: Mar 28 to Apr 11Transplant outside: May 2 to May 16Plant for fall: Jun 16 to Jul 7
Start indoors: Mar 28 to Apr 11Transplant outside: May 9 to May 23Plant for fall: Jun 16 to Jul 7
Start indoors: Apr 11 to Apr 25Transplant outside: Jun 13 to Jun 27Sow outdoors: Jun 13 to Jun 27
Start indoors: Apr 11 to Apr 25Transplant outside: May 30 to Jun 13
Sow outdoors: Apr 11 to May 2Plant for fall: Jun 30 to Jul 21
Sow outdoors: Apr 11 to May 2Plant for fall: Jul 28 to Aug 18
Sow outdoors: Apr 18 to May 30Plant for fall: Aug 11 to Sep 1
Start indoors: Apr 25 to May 2Transplant outside: Jun 6 to Jun 13Sow outdoors: May 30 to Jun 13Plant for fall: Jul 7 to Jul 21
Start indoors: Apr 25 to May 2Sow outdoors: May 30 to Jun 13Plant for fall: Jul 14 to Jul 28
Start indoors: Apr 25 to May 2Sow outdoors: May 30 to Jun 13
Start indoors: Apr 25 to May 2Transplant outside: Jun 6 to Jun 20
Sow outdoors: May 2 to May 30Plant for fall: Jun 30 to Jul 14
Sow outdoors: May 2 to May 30Plant for fall: Jul 14 to Jul 28
Sow outdoors: May 2 to May 23
Sow outdoors: May 9 to Jun 6Plant for fall: Jul 14 to Jul 28
Sow outdoors: May 9 to May 30Plant for fall: Jul 28 to Aug 18
Sow outdoors: May 30 to Jun 20Plant for fall: Jul 7 to Jul 21
Sow outdoors: May 30 to Jun 13
Transplant outside: Jun 6 to Jun 27
Plant for fall: Sep 8 to Oct 13
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Evergreen, CO
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 28 – Mar 14 | Apr 25 – May 9 | — | — |
| Peppers | Mar 14 – Mar 28 | Jun 6 – Jun 20 | — | — |
| Eggplant | Mar 14 – Mar 28 | Jun 6 – Jun 20 | — | — |
| Tomatoes | Mar 28 – Apr 11 | May 30 – Jun 13 | — | — |
| Lettuce | Mar 28 – Apr 11 | May 2 – May 16 | Apr 25 – May 30 | Jul 28 – Aug 25 |
| Kale | Mar 28 – Apr 11 | Apr 25 – May 9 | Apr 25 – May 9 | Jul 14 – Aug 4 |
| Broccoli | Mar 28 – Apr 11 | May 9 – May 23 | — | Jun 16 – Jul 7 |
| Cabbage | Mar 28 – Apr 11 | May 2 – May 16 | — | Jun 16 – Jul 7 |
| Cauliflower | Mar 28 – Apr 11 | May 9 – May 23 | — | Jun 16 – Jul 7 |
| Okra | Apr 11 – Apr 25 | Jun 13 – Jun 27 | Jun 13 – Jun 27 | — |
| Basil | Apr 11 – Apr 25 | May 30 – Jun 13 | — | — |
| Peas | — | — | Apr 11 – May 2 | Jun 30 – Jul 21 |
| Spinach | — | — | Apr 11 – May 2 | Jul 28 – Aug 18 |
| Radishes | — | — | Apr 18 – May 30 | Aug 11 – Sep 1 |
| Cucumbers | Apr 25 – May 2 | Jun 6 – Jun 13 | May 30 – Jun 13 | Jul 7 – Jul 21 |
| Zucchini & Summer Squash | Apr 25 – May 2 | — | May 30 – Jun 13 | Jul 14 – Jul 28 |
| Winter Squash & Pumpkins | Apr 25 – May 2 | — | May 30 – Jun 13 | — |
| Melons & Watermelon | Apr 25 – May 2 | Jun 6 – Jun 20 | — | — |
| Carrots | — | — | May 2 – May 30 | Jun 30 – Jul 14 |
| Beets | — | — | May 2 – May 30 | Jul 14 – Jul 28 |
| Potatoes | — | — | May 2 – May 23 | — |
| Swiss Chard | — | — | May 9 – Jun 6 | Jul 14 – Jul 28 |
| Cilantro | — | — | May 9 – May 30 | Jul 28 – Aug 18 |
| Green Beans | — | — | May 30 – Jun 20 | Jul 7 – Jul 21 |
| Sweet Corn | — | — | May 30 – Jun 13 | — |
| Sweet Potatoes | — | Jun 6 – Jun 27 | — | — |
| Garlic | — | — | — | Sep 8 – Oct 13 |
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 Evergreen, CO weather station, 2 km away (elevation 6,985 ft (2,129 m)).
ZIP codes in Evergreen: 80437 80439
Frost dates near Evergreen
- Kittredge May 23 · Sep 22
- Indian Hills May 23 · Sep 22
- Idledale May 23 · Sep 22
- Golden May 3 · Oct 7
- Conifer May 23 · Sep 22
- Morrison May 2 · Oct 11
- Pine Jun 16 · Sep 8
- Black Hawk Jun 5 · Sep 16
Frequently asked questions
When is the last frost in Evergreen, CO?
The median last spring frost in Evergreen, CO is May 23. There is still about a 10% chance of frost after June 10, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Evergreen, CO?
The median first fall frost is September 22, with about a 10% chance of frost before September 6.
How long is the growing season in Evergreen, CO?
About 122 days between the median last spring frost and first fall frost.
What planting zone is Evergreen, CO?
Evergreen, CO is in USDA hardiness zone 5b.