When to plant in Dacono, CO

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

Safe to plant out

May 23

1 year in 10 has a later frost

Average last frost

May 9

about a 50% chance of a later one

Average first fall frost

Sep 27

1 year in 10 by Sep 11

Frost-free days

141

median, 1991–2020

Station used: Longmont 2 Ese · 15.1 km away · station 1509 m, town 1533 m. How we match towns to stations

This season

Plan your garden.

Build my Dacono plan

Planting dates for common crops

Crop	Start indoors	Plant out or sow	Harvest from
Tomato	Mar 28 – Apr 11	May 23 – Jun 6	Jul 17
Sweet pepper	Mar 14 – Mar 28	May 23 – Jun 6	Jul 22
Lettuce (leaf)	Mar 7 – Mar 14	Apr 11 – Apr 25	May 21
Peas	—	Mar 28 – Apr 25	May 22
Bush beans	—	May 16 – Jun 6	Jul 5
Carrot	—	Apr 18 – May 30	Jun 17
Beet	—	Apr 13 – May 25	Jun 2
Potato	—	Apr 18 – May 9	Jun 27
Kale	Feb 28 – Mar 14	Apr 11 – Apr 25	May 24
Broccoli	Feb 28 – Mar 14	Apr 11 – May 2	Jun 10
Cucumber	Apr 25 – May 2	May 23 – Jun 6	Jul 12
Summer squash and zucchini	Apr 25 – May 2	May 23 – Jun 6	Jul 7
Winter squash	Apr 25 – May 2	May 23 – Jun 6	Aug 11
Sweet corn	—	May 16 – Jun 6	Jul 15
Onion (from sets)	—	Apr 11 – May 2	Jul 10
Garlic	—	Sep 13 – Oct 11 (fall)	following summer
Spinach	—	Mar 28 – Apr 25	May 5
Basil	Apr 11 – Apr 25	May 23 – Jun 6	Jul 19

Plan all 65 crops for Dacono

Dacono'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
1895	May 21
1896	Apr 30
1897	Apr 21
1911	May 10
1912	May 13
1913	May 14
1914	Apr 18
1915	Jun 6
1916	May 16
1917	May 10
1918	May 11
1919	Jun 2
1920	Apr 30
1921	May 1
1922	Jun 1
1923	May 15
1924	May 24
1925	Apr 30
1926	Apr 24
1927	May 9
1928	May 3
1929	May 18
1930	May 22
1931	May 21
1932	Apr 30
1933	May 15
1934	May 13
1935	May 5
1936	Apr 10
1937	May 13
1938	May 8
1939	Apr 21
1940	May 1
1941	Apr 24
1942	May 15
1943	May 20
1944	May 5
1945	Jun 16
1946	May 20
1947	Jun 13
1948	May 10
1949	Apr 24
1950	May 27
1951	Jun 2
1952	Apr 23
1953	May 14
1954	May 4
1955	May 17
1956	Apr 24
1957	May 18
1958	May 1
1959	Apr 22
1960	May 2
1961	May 2
1962	May 1
1963	Apr 23
1964	May 30
1965	May 9
1966	May 13
1967	May 14
1968	May 17
1969	Apr 28
1970	May 15
1971	Apr 28
1972	May 3
1973	May 3
1974	Apr 22
1975	May 3
1976	Apr 28
1977	Apr 21
1978	May 10
1979	May 12
1980	Apr 18
1981	May 10
1982	May 7
1983	May 18
1984	May 1
1985	Apr 27
1986	Apr 19
1987	Apr 22
1988	May 4
1989	May 6
1990	May 18
1991	May 3
1992	Apr 26
1993	May 10
1994	May 3
1995	May 4
1996	Apr 30
1997	May 12
1998	Jun 6
1999	May 18
2000	May 13
2001	May 22
2002	May 24
2003	May 11
2004	May 1
2018	Apr 26
2019	May 21
2020	Apr 19
2021	Apr 23
2022	Apr 26
2023	Apr 23
2024	Apr 21
2025	Apr 20
2026	May 7

Each year's frost-free daysLong-term trend

See the data as a table

Year	Frost-free days
1895	122
1896	149
1911	130
1912	121
1913	128
1914	148
1915	119
1916	117
1917	138
1918	141
1919	111
1920	145
1921	141
1922	126
1923	149
1924	124
1925	160
1926	151
1927	138
1928	145
1929	112
1930	125
1931	126
1932	155
1933	138
1934	134
1935	144
1936	169
1937	146
1938	153
1939	161
1940	158
1941	137
1942	126
1943	122
1944	152
1945	88
1946	125
1947	93
1948	148
1949	169
1950	128
1951	105
1952	164
1953	142
1954	162
1955	142
1956	168
1957	126
1958	152
1959	159
1960	166
1961	145
1962	131
1963	181
1964	119
1965	130
1966	140
1967	154
1968	139
1969	158
1970	133
1971	141
1972	149
1973	146
1974	158
1975	139
1976	161
1977	163
1978	133
1979	144
1980	181
1981	159
1982	129
1983	124
1984	146
1985	148
1986	174
1987	170
1988	137
1989	128
1990	141
1991	142
1993	125
1994	141
1995	139
1996	148
1997	149
1998	121
1999	125
2000	132
2001	109
2003	153
2004	167
2018	166
2019	136
2020	142
2021	173
2022	180
2023	173
2024	192
2025	181

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

See the data as a table

Year	Growing-season temperature
1895	16.4 °C
1896	17.6 °C
1911	17.4 °C
1912	15.0 °C
1913	17.0 °C
1914	16.6 °C
1915	15.5 °C
1916	16.0 °C
1917	14.9 °C
1918	15.8 °C
1919	17.4 °C
1920	15.2 °C
1921	15.8 °C
1922	16.5 °C
1923	16.3 °C
1924	16.1 °C
1925	18.0 °C
1926	16.9 °C
1927	16.5 °C
1928	15.6 °C
1929	16.3 °C
1930	17.0 °C
1931	17.3 °C
1932	17.2 °C
1933	16.5 °C
1934	18.0 °C
1935	16.3 °C
1936	18.3 °C
1937	17.3 °C
1938	16.9 °C
1939	17.5 °C
1940	17.0 °C
1941	16.1 °C
1942	16.4 °C
1943	17.0 °C
1944	16.4 °C
1945	15.3 °C
1946	17.0 °C
1947	17.1 °C
1948	17.3 °C
1949	17.1 °C
1950	15.6 °C
1951	15.6 °C
1952	17.4 °C
1953	16.4 °C
1954	18.3 °C
1955	17.2 °C
1956	17.1 °C
1957	15.7 °C
1958	17.1 °C
1959	16.3 °C
1960	17.1 °C
1961	16.0 °C
1962	16.9 °C
1963	18.0 °C
1964	16.6 °C
1965	15.7 °C
1966	17.1 °C
1967	16.1 °C
1968	15.9 °C
1969	17.6 °C
1970	16.8 °C
1971	16.5 °C
1972	16.7 °C
1973	16.0 °C
1974	16.7 °C
1975	15.9 °C
1976	17.0 °C
1977	18.3 °C
1978	17.4 °C
1979	17.2 °C
1980	17.7 °C
1981	18.4 °C
1982	16.9 °C
1983	16.6 °C
1984	16.6 °C
1985	17.4 °C
1986	17.2 °C
1987	17.6 °C
1988	17.0 °C
1989	16.6 °C
1990	16.6 °C
1991	17.4 °C
1993	15.9 °C
1994	17.9 °C
1995	15.8 °C
1996	17.0 °C
1997	16.0 °C
1998	16.9 °C
1999	15.3 °C
2000	17.7 °C
2001	17.2 °C
2002	17.4 °C
2003	18.5 °C
2004	17.1 °C
2018	18.5 °C
2019	17.7 °C
2020	18.2 °C
2021	18.2 °C
2022	18.7 °C
2023	17.7 °C
2024	18.9 °C
2025	18.4 °C
2026	19.6 °C

What this means for you: Since 1895, Dacono's last spring frost has come about 1 day earlier per decade, on average. The frost-free season has grown by about 2 days per decade. Year-to-year swings are large, so keep using the safe date rather than the trend.

Source: daily records from Longmont 2 Ese (NOAA GHCN-Daily). Years with too many missing days are left out.

Nearby towns

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