When to plant in Alamosa, CO

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

Safe to plant out

Jun 20

1 year in 10 has a later frost

Average last frost

Jun 8

about a 50% chance of a later one

Average first fall frost

Sep 12

1 year in 10 by Aug 28

Frost-free days

median, 1991–2020

Station used: Alamosa-Bergman Fld · 3.4 km away · station 2297 m, town 2299 m. How we match towns to stations

This season

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Planting dates for common crops

Crop	Start indoors	Plant out or sow	Harvest from
Tomato	Apr 25 – May 9	Jun 20 – Jul 4	Aug 14
Sweet pepper	Apr 11 – Apr 25	Jun 20 – Jul 4	Aug 19
Lettuce (leaf)	Apr 6 – Apr 13	May 11 – May 25	Jun 20
Peas	—	Apr 27 – May 25	Jun 21
Bush beans	—	Jun 13 – Jul 4	Aug 2
Carrot	—	May 18 – Jun 29	Jul 17
Beet	—	May 11 – Jun 22	Jun 30
Potato	—	May 18 – Jun 8	Jul 27
Kale	Mar 30 – Apr 13	May 11 – May 25	Jun 23
Broccoli	Mar 30 – Apr 13	May 11 – Jun 1	Jul 10
Cucumber	May 23 – May 30	Jun 20 – Jul 4	Aug 9
Summer squash and zucchini	May 23 – May 30	Jun 20 – Jul 4	Aug 4
Winter squash Season likely too short	May 23 – May 30	Jun 20 – Jul 4	Sep 8
Sweet corn	—	Jun 13 – Jul 4	Aug 12
Onion (from sets)	—	May 11 – Jun 1	Aug 9
Garlic	—	Aug 29 – Sep 26 (fall)	following summer
Spinach	—	Apr 27 – May 25	Jun 4
Basil	May 9 – May 23	Jun 20 – Jul 4	Aug 16

Plan all 65 crops for Alamosa

Alamosa'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
1948	May 16
1949	Jun 2
1950	Jun 9
1951	Jun 11
1952	May 19
1953	Jun 4
1954	Jun 12
1955	Jun 10
1956	May 28
1957	Jun 17
1958	May 13
1959	May 26
1960	May 26
1961	Jun 4
1962	Jun 16
1963	Jun 11
1964	Jun 23
1965	May 29
1966	Jun 4
1967	May 17
1968	Jun 11
1969	Jun 27
1970	Jun 17
1971	Jun 9
1972	May 25
1973	Jun 19
1974	Jun 10
1975	Jun 12
1976	Jun 25
1977	May 29
1978	Jun 7
1979	Jun 20
1980	Jun 15
1981	Jun 16
1982	Jun 7
1983	Jun 15
1984	Jun 10
1985	Jun 27
1986	May 27
1987	May 31
1988	Jun 1
1989	Jun 11
1990	Jun 17
1991	Jun 2
1992	May 14
1993	Jun 9
1994	May 21
1995	Jun 11
1996	Jun 3
1997	Jul 2
1998	Jun 19
1999	Jun 6
2000	May 27
2001	Jun 16
2002	Jun 12
2003	Jun 8
2004	Jun 13
2005	Jun 14
2006	Jun 17
2007	Jun 8
2008	Jun 14
2009	May 6
2010	Jun 23
2011	Jun 15
2012	Jun 11
2013	Jun 6
2015	May 26
2016	May 28
2017	Jun 14
2018	Jun 2
2019	May 31
2020	Jul 1
2021	May 28
2022	Jun 2
2023	Jun 24
2024	May 30

Each year's frost-free daysLong-term trend

See the data as a table

Year	Frost-free days
1948	116
1949	102
1950	94
1951	85
1952	105
1953	91
1954	93
1955	81
1956	92
1957	84
1958	124
1959	98
1960	112
1961	90
1962	69
1963	107
1964	58
1965	103
1966	91
1967	119
1968	84
1969	82
1970	81
1971	87
1972	123
1973	75
1974	86
1975	99
1976	87
1977	111
1978	81
1979	86
1980	66
1981	94
1982	113
1983	97
1984	109
1985	70
1986	106
1987	99
1988	105
1989	89
1990	107
1991	103
1992	104
1993	96
1994	116
1995	101
1996	96
1997	93
1998	94
1999	106
2000	105
2001	83
2002	73
2003	95
2004	75
2005	90
2006	91
2007	102
2008	81
2009	94
2010	75
2011	94
2012	86
2013	109
2015	114
2016	109
2017	95
2018	103
2019	104
2020	68
2021	111
2022	101
2023	87
2024	104

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

See the data as a table

Year	Growing-season temperature
1948	13.6 °C
1949	13.3 °C
1950	12.5 °C
1951	13.2 °C
1952	13.7 °C
1953	12.9 °C
1954	14.2 °C
1955	12.9 °C
1956	13.5 °C
1957	12.6 °C
1958	13.8 °C
1959	13.4 °C
1960	13.5 °C
1961	13.1 °C
1962	13.1 °C
1963	13.9 °C
1964	13.0 °C
1965	12.5 °C
1966	13.6 °C
1967	12.6 °C
1968	12.1 °C
1969	13.8 °C
1970	12.6 °C
1971	12.4 °C
1972	13.3 °C
1973	12.3 °C
1974	12.7 °C
1975	12.1 °C
1976	12.9 °C
1977	13.8 °C
1978	13.1 °C
1979	12.9 °C
1980	13.1 °C
1981	13.9 °C
1982	12.8 °C
1983	12.5 °C
1984	13.5 °C
1985	13.3 °C
1986	13.1 °C
1987	13.1 °C
1988	13.4 °C
1989	13.8 °C
1990	13.5 °C
1991	13.2 °C
1992	13.5 °C
1993	12.7 °C
1994	13.5 °C
1995	12.2 °C
1996	13.5 °C
1997	12.9 °C
1998	13.2 °C
1999	12.5 °C
2000	14.2 °C
2001	14.1 °C
2002	14.1 °C
2003	13.7 °C
2004	13.1 °C
2005	13.8 °C
2006	13.8 °C
2007	14.1 °C
2008	13.1 °C
2009	13.2 °C
2010	14.2 °C
2011	14.1 °C
2012	14.5 °C
2013	13.7 °C
2015	14.0 °C
2016	13.8 °C
2017	13.8 °C
2018	14.6 °C
2019	13.6 °C
2020	14.5 °C
2021	14.5 °C
2022	14.7 °C
2023	14.0 °C
2024	14.3 °C

What this means for you: Since 1948, Alamosa's last spring frost has stayed at about the same time of year. Year-to-year swings are large, so keep using the safe date rather than the trend.

Source: daily records from Alamosa-Bergman Fld (NOAA GHCN-Daily). Years with too many missing days are left out.

Nearby towns

Alamosa East Monte Vista Center Del Norte Questa, NM Chama, NM