When to plant in Silverthorne, CO

Planting dates worked out from Silverthorne's own frost records, not a generic zone chart.

Safe to plant out

Jul 10

1 year in 10 has a later frost

Average last frost

Jun 29

about a 50% chance of a later one

Average first fall frost

Aug 16

1 year in 10 by Jul 27

Frost-free days

median, 1991–2020

Station used: Dillon 1 E · 3.6 km away · station 2768 m, town 2669 m. How we match towns to stations

This season

Plan your garden.

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Planting dates for common crops

Crop	Start indoors	Plant out or sow	Harvest from
Tomato Season likely too short	May 15 – May 29	Jul 10 – Jul 24	Sep 3
Sweet pepper Season likely too short	May 1 – May 15	Jul 10 – Jul 24	Sep 8
Lettuce (leaf)	Apr 27 – May 4	Jun 1 – Jun 15	Jul 11
Peas	—	May 18 – Jun 15	Jul 12
Bush beans Season likely too short	—	Jul 3 – Jul 24	Aug 22
Carrot	—	Jun 8 – Jul 20	Aug 7
Beet	—	Jun 1 – Jul 13	Jul 21
Potato	—	Jun 8 – Jun 29	Aug 17
Kale	Apr 20 – May 4	Jun 1 – Jun 15	Jul 14
Broccoli	Apr 20 – May 4	Jun 1 – Jun 22	Jul 31
Cucumber Season likely too short	Jun 12 – Jun 19	Jul 10 – Jul 24	Aug 29
Summer squash and zucchini Season likely too short	Jun 12 – Jun 19	Jul 10 – Jul 24	Aug 24
Winter squash Season likely too short	Jun 12 – Jun 19	Jul 10 – Jul 24	Sep 28
Sweet corn Season likely too short	—	Jul 3 – Jul 24	Sep 1
Onion (from sets)	—	Jun 1 – Jun 22	Aug 30
Garlic	—	Aug 2 – Aug 30 (fall)	following summer
Spinach	—	May 18 – Jun 15	Jun 25
Basil Season likely too short	May 29 – Jun 12	Jul 10 – Jul 24	Sep 5

Plan all 65 crops for Silverthorne

Silverthorne'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
1911	Jul 14
1913	Jul 13
1914	Jul 11
1915	Jul 10
1916	Jul 4
1917	Jul 10
1918	Jul 2
1919	Jul 8
1920	Jul 14
1921	Jul 12
1922	Jul 14
1923	Jul 9
1924	Jul 14
1925	Jul 14
1926	Jul 13
1927	Jul 14
1928	Jul 10
1929	Jul 10
1930	Jul 9
1931	Jul 10
1932	Jul 8
1933	Jul 2
1934	Jul 14
1935	Jul 14
1936	Jul 3
1937	Jul 10
1938	Jul 9
1939	Jul 9
1940	Jul 4
1941	Jul 9
1942	Jul 13
1943	Jul 13
1944	Jul 13
1945	Jul 13
1946	Jul 10
1947	Jul 12
1948	Jul 14
1949	Jun 29
1950	Jul 14
1951	Jul 13
1952	Jul 14
1953	Jun 30
1954	Jul 3
1955	Jul 12
1956	Jul 11
1957	Jul 6
1958	Jul 14
1959	Jul 12
1960	Jul 13
1961	Jun 16
1962	Jun 18
1963	Jun 20
1964	Jun 24
1965	Jul 10
1966	Jul 9
1967	Jun 30
1968	Jul 6
1969	Jul 8
1970	Jul 1
1971	Jul 11
1972	Jul 5
1973	Jun 23
1974	Jun 12
1975	Jun 30
1976	Jun 28
1977	Jul 12
1978	Jul 5
1979	Jul 7
1980	Jun 28
1981	Jun 18
1982	Jul 10
1983	Jul 4
1984	Jun 23
1985	Jun 29
1986	Jun 22
1987	Jul 14
1988	Jun 14
1989	Jul 2
1990	Jun 22
1991	Jul 4
1992	Jul 4
1993	Jul 7
1994	Jul 8
1995	Jun 27
1996	Jun 23
1997	Jul 2
1998	Jun 26
1999	Jun 13
2000	Jun 22
2001	Jun 17
2002	Jun 23
2003	Jul 10
2004	Jul 6
2005	Jul 5
2006	Jun 27
2007	Jun 19
2008	Jun 25
2010	Jul 11
2011	Jun 27
2012	Jun 20
2013	Jun 24
2014	Jun 29
2015	Jun 10
2016	Jul 14
2017	Jul 2
2018	Jul 2
2019	Jul 10
2020	Jul 11
2021	Jun 28
2022	Jun 23
2023	Jul 3
2024	Jul 10
2025	Jun 30
2026	Jul 2

Each year's frost-free daysLong-term trend

See the data as a table

Year	Frost-free days
1911	1
1913	11
1914	12
1915	6
1916	14
1917	20
1918	18
1919	28
1920	2
1921	24
1922	3
1923	19
1924	0
1925	9
1926	10
1927	0
1928	4
1929	32
1930	12
1931	7
1933	22
1935	0
1936	49
1937	9
1938	9
1939	7
1941	6
1942	7
1943	2
1944	1
1945	34
1946	22
1947	37
1948	0
1949	15
1950	1
1951	1
1952	0
1953	20
1954	28
1955	5
1956	4
1957	37
1958	5
1959	4
1960	1
1961	35
1962	26
1963	96
1964	33
1965	21
1966	31
1967	27
1968	39
1969	66
1970	40
1971	18
1972	46
1973	28
1974	58
1975	32
1976	37
1977	18
1978	16
1979	11
1980	49
1981	86
1982	53
1983	25
1984	71
1985	41
1986	35
1987	33
1988	76
1989	49
1990	30
1991	66
1992	11
1993	14
1994	58
1995	34
1996	42
1997	40
1998	62
1999	82
2000	76
2001	76
2002	47
2003	52
2004	23
2005	44
2006	61
2007	83
2008	48
2010	32
2011	41
2012	76
2013	50
2014	33
2015	47
2016	28
2017	46
2018	28
2019	44
2020	32
2021	57
2022	79
2023	36
2024	50
2025	41

Each year's average temperature, April to SeptemberLong-term trend

See the data as a table

Year	Growing-season temperature
1911	8.3 °C
1913	7.5 °C
1914	7.8 °C
1915	7.8 °C
1916	7.6 °C
1917	6.7 °C
1918	7.8 °C
1919	8.8 °C
1920	6.7 °C
1921	7.5 °C
1922	7.7 °C
1923	7.1 °C
1924	6.9 °C
1925	8.4 °C
1926	8.5 °C
1927	7.9 °C
1928	7.6 °C
1929	7.0 °C
1930	8.1 °C
1931	8.1 °C
1933	7.6 °C
1934	8.8 °C
1935	8.1 °C
1936	9.5 °C
1937	8.7 °C
1938	8.1 °C
1939	9.3 °C
1940	9.0 °C
1941	8.4 °C
1942	8.0 °C
1943	8.8 °C
1944	7.8 °C
1945	7.7 °C
1946	8.8 °C
1947	8.2 °C
1948	8.3 °C
1949	8.1 °C
1950	7.2 °C
1951	7.8 °C
1952	8.8 °C
1953	8.2 °C
1954	9.3 °C
1955	8.1 °C
1956	8.5 °C
1957	7.7 °C
1958	8.3 °C
1959	8.0 °C
1960	8.3 °C
1961	8.7 °C
1962	9.9 °C
1963	11.1 °C
1964	8.4 °C
1965	7.7 °C
1966	8.7 °C
1967	8.2 °C
1968	7.5 °C
1969	9.7 °C
1970	8.1 °C
1971	8.3 °C
1972	8.8 °C
1973	7.9 °C
1974	8.5 °C
1975	7.8 °C
1976	8.6 °C
1977	9.4 °C
1978	8.7 °C
1979	8.5 °C
1980	8.4 °C
1981	9.5 °C
1982	7.9 °C
1983	7.8 °C
1984	8.1 °C
1985	8.7 °C
1986	8.4 °C
1987	8.6 °C
1989	8.7 °C
1990	8.9 °C
1991	8.2 °C
1992	8.7 °C
1993	7.8 °C
1994	9.5 °C
1995	7.8 °C
1996	8.6 °C
1997	8.4 °C
1998	8.9 °C
1999	8.0 °C
2000	9.8 °C
2001	9.6 °C
2002	9.9 °C
2003	9.0 °C
2004	8.6 °C
2005	8.8 °C
2006	9.1 °C
2007	10.2 °C
2008	7.7 °C
2010	8.8 °C
2011	8.3 °C
2012	10.0 °C
2013	8.7 °C
2014	8.5 °C
2015	9.0 °C
2016	8.8 °C
2017	8.7 °C
2018	9.7 °C
2019	8.9 °C
2020	9.3 °C
2021	9.5 °C
2022	9.3 °C
2023	8.8 °C
2024	9.5 °C
2025	9.5 °C
2026	11.0 °C

What this means for you: Since 1911, Silverthorne's last spring frost has come about 1 day earlier per decade, on average. The frost-free season has grown by about 5 days per decade. Year-to-year swings are large, so keep using the safe date rather than the trend.

Source: daily records from Dillon 1 E (NOAA GHCN-Daily). Years with too many missing days are left out.

Nearby towns

Frisco Keystone Breckenridge Vail Minturn Georgetown