When to plant in Evergreen, CO
Planting dates worked out from Evergreen's own frost records, not a generic zone chart.
Safe to plant out
Jun 18
1 year in 10 has a later frost
Average last frost
May 31
about a 50% chance of a later one
Average first fall frost
Sep 15
1 year in 10 by Sep 2
Frost-free days
112
median, 1991–2020
Station used: Evergreen · 0.6 km away · station 2134 m, town 2150 m. How we match towns to stations
This season
Plan your garden.
Planting dates for common crops
| Crop | Start indoors | Plant out or sow | Harvest from |
|---|---|---|---|
| Tomato | Apr 23 – May 7 | Jun 18 – Jul 2 | Aug 12 |
| Sweet pepper | Apr 9 – Apr 23 | Jun 18 – Jul 2 | Aug 17 |
| Lettuce (leaf) | Mar 29 – Apr 5 | May 3 – May 17 | Jun 12 |
| Peas | — | Apr 23 – May 21 | Jun 17 |
| Bush beans | — | Jun 11 – Jul 2 | Jul 31 |
| Carrot | — | May 10 – Jun 21 | Jul 9 |
| Beet | — | May 6 – Jun 17 | Jun 25 |
| Potato | — | May 10 – May 31 | Jul 19 |
| Kale | Mar 22 – Apr 5 | May 3 – May 17 | Jun 15 |
| Broccoli | Mar 22 – Apr 5 | May 3 – May 24 | Jul 2 |
| Cucumber | May 21 – May 28 | Jun 18 – Jul 2 | Aug 7 |
| Summer squash and zucchini | May 21 – May 28 | Jun 18 – Jul 2 | Aug 2 |
| Winter squash Season likely too short |
May 21 – May 28 | Jun 18 – Jul 2 | Sep 6 |
| Sweet corn | — | Jun 11 – Jul 2 | Aug 10 |
| Onion (from sets) | — | May 3 – May 24 | Aug 1 |
| Garlic | — | Sep 1 – Sep 29 (fall) | following summer |
| Spinach | — | Apr 23 – May 21 | May 31 |
| Basil | May 7 – May 21 | Jun 18 – Jul 2 | Aug 14 |
Evergreen's weather over time
How the growing season has shifted here, year by year, from the station's own records.
Each year's last spring frostLong-term trend
See the data as a table
| Year | Last spring frost |
|---|---|
| 1962 | Jun 17 |
| 1963 | May 21 |
| 1964 | Jun 23 |
| 1965 | Jun 6 |
| 1966 | Jun 6 |
| 1967 | May 21 |
| 1968 | Jul 2 |
| 1969 | Jun 27 |
| 1970 | Jun 16 |
| 1971 | Jun 5 |
| 1973 | Jun 19 |
| 1974 | Jun 7 |
| 1975 | Jun 10 |
| 1976 | Jun 18 |
| 1977 | May 26 |
| 1978 | May 28 |
| 1980 | May 31 |
| 1981 | Jun 16 |
| 1982 | Jun 7 |
| 1983 | Jun 15 |
| 1985 | May 23 |
| 1986 | Jun 11 |
| 1987 | May 28 |
| 1988 | Jun 1 |
| 1989 | May 27 |
| 1990 | May 21 |
| 1991 | May 13 |
| 1992 | Jun 2 |
| 1993 | May 13 |
| 1994 | May 10 |
| 1995 | Jun 26 |
| 1996 | May 27 |
| 1997 | May 16 |
| 1998 | Jun 6 |
| 1999 | Jun 11 |
| 2000 | Jun 18 |
| 2001 | Jun 17 |
| 2002 | Jun 24 |
| 2003 | Jun 14 |
| 2004 | Jun 22 |
| 2005 | Jun 11 |
| 2006 | May 16 |
| 2007 | Jun 8 |
| 2008 | Jun 13 |
| 2009 | May 14 |
| 2010 | May 25 |
| 2011 | May 20 |
| 2012 | Jun 11 |
| 2013 | Jun 2 |
| 2014 | May 15 |
| 2015 | May 25 |
| 2016 | May 19 |
| 2017 | May 28 |
| 2018 | May 6 |
| 2019 | May 30 |
| 2020 | May 27 |
| 2021 | May 25 |
| 2022 | May 31 |
| 2023 | May 9 |
| 2024 | May 25 |
| 2026 | May 22 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1962 | 75 |
| 1963 | 131 |
| 1964 | 58 |
| 1965 | 86 |
| 1966 | 115 |
| 1968 | 43 |
| 1969 | 82 |
| 1970 | 85 |
| 1971 | 101 |
| 1973 | 74 |
| 1974 | 86 |
| 1975 | 100 |
| 1976 | 100 |
| 1977 | 113 |
| 1978 | 106 |
| 1980 | 92 |
| 1981 | 93 |
| 1982 | 113 |
| 1983 | 96 |
| 1985 | 122 |
| 1986 | 97 |
| 1987 | 112 |
| 1988 | 95 |
| 1989 | 108 |
| 1990 | 134 |
| 1991 | 125 |
| 1992 | 85 |
| 1993 | 112 |
| 1994 | 128 |
| 1995 | 86 |
| 1996 | 102 |
| 1997 | 135 |
| 1998 | 55 |
| 1999 | 93 |
| 2000 | 56 |
| 2001 | 82 |
| 2002 | 78 |
| 2003 | 91 |
| 2004 | 91 |
| 2005 | 95 |
| 2006 | 109 |
| 2008 | 115 |
| 2009 | 130 |
| 2010 | 104 |
| 2011 | 123 |
| 2012 | 114 |
| 2013 | 113 |
| 2014 | 119 |
| 2015 | 143 |
| 2016 | 114 |
| 2017 | 127 |
| 2018 | 144 |
| 2019 | 126 |
| 2020 | 104 |
| 2021 | 119 |
| 2022 | 129 |
| 2023 | 129 |
| 2024 | 150 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1963 | 14.1 °C |
| 1964 | 12.6 °C |
| 1965 | 12.0 °C |
| 1966 | 13.4 °C |
| 1967 | 11.7 °C |
| 1968 | 11.4 °C |
| 1969 | 12.8 °C |
| 1970 | 12.2 °C |
| 1971 | 12.1 °C |
| 1973 | 11.5 °C |
| 1974 | 12.5 °C |
| 1975 | 11.5 °C |
| 1976 | 12.3 °C |
| 1977 | 13.4 °C |
| 1978 | 12.7 °C |
| 1980 | 12.8 °C |
| 1981 | 13.4 °C |
| 1982 | 11.8 °C |
| 1983 | 11.4 °C |
| 1985 | 13.1 °C |
| 1986 | 12.9 °C |
| 1987 | 13.1 °C |
| 1988 | 13.4 °C |
| 1989 | 12.8 °C |
| 1990 | 12.9 °C |
| 1991 | 12.8 °C |
| 1992 | 13.1 °C |
| 1993 | 12.3 °C |
| 1994 | 13.9 °C |
| 1995 | 12.1 °C |
| 1996 | 13.4 °C |
| 1997 | 12.7 °C |
| 1998 | 13.2 °C |
| 1999 | 12.5 °C |
| 2000 | 14.3 °C |
| 2002 | 13.7 °C |
| 2003 | 13.6 °C |
| 2004 | 12.6 °C |
| 2005 | 13.2 °C |
| 2006 | 13.9 °C |
| 2008 | 12.7 °C |
| 2009 | 12.5 °C |
| 2010 | 13.3 °C |
| 2011 | 13.2 °C |
| 2012 | 14.6 °C |
| 2013 | 13.0 °C |
| 2014 | 12.8 °C |
| 2015 | 13.1 °C |
| 2016 | 13.2 °C |
| 2017 | 12.8 °C |
| 2018 | 14.0 °C |
| 2019 | 13.3 °C |
| 2020 | 13.5 °C |
| 2021 | 13.2 °C |
| 2022 | 13.6 °C |
| 2023 | 12.9 °C |
| 2024 | 14.0 °C |
| 2026 | 14.7 °C |
What this means for you: Since 1962, Evergreen's last spring frost has come about 3 days earlier per decade, on average. The frost-free season has grown by about 6 days per decade. Year-to-year swings are large, so keep using the safe date rather than the trend.
Source: daily records from Evergreen (NOAA GHCN-Daily). Years with too many missing days are left out.