When to plant in Riverton, UT

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

Safe to plant out

May 16

1 year in 10 has a later frost

Average last frost

May 1

about a 50% chance of a later one

Average first fall frost

Oct 10

1 year in 10 by Sep 26

Frost-free days

154

median, 1991–2020

Station used: Utah Lake Lehi · 18.3 km away · station 1373 m, town 1353 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	Mar 21 – Apr 4	May 16 – May 30	Jul 10
Sweet pepper	Mar 7 – Mar 21	May 16 – May 30	Jul 15
Lettuce (leaf)	Feb 27 – Mar 6	Apr 3 – Apr 17	May 13
Peas	—	Mar 22 – Apr 19	May 16
Bush beans	—	May 9 – May 30	Jun 28
Carrot	—	Apr 10 – May 22	Jun 9
Beet	—	Apr 8 – May 20	May 28
Potato	—	Apr 10 – May 1	Jun 19
Kale	Feb 20 – Mar 6	Apr 3 – Apr 17	May 16
Broccoli	Feb 20 – Mar 6	Apr 3 – Apr 24	Jun 2
Cucumber	Apr 18 – Apr 25	May 16 – May 30	Jul 5
Summer squash and zucchini	Apr 18 – Apr 25	May 16 – May 30	Jun 30
Winter squash	Apr 18 – Apr 25	May 16 – May 30	Aug 4
Sweet corn	—	May 9 – May 30	Jul 8
Onion (from sets)	—	Apr 3 – Apr 24	Jul 2
Garlic	—	Sep 26 – Oct 24 (fall)	following summer
Spinach	—	Mar 22 – Apr 19	Apr 29
Basil	Apr 4 – Apr 18	May 16 – May 30	Jul 12

Plan all 65 crops for Riverton

Riverton'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
1906	May 17
1909	May 14
1911	May 11
1913	May 4
1924	May 8
1925	Apr 27
1926	May 10
1927	May 30
1928	May 4
1929	Jun 18
1930	May 23
1931	May 19
1932	May 23
1933	May 15
1934	Apr 18
1935	May 15
1936	May 6
1937	May 2
1938	May 19
1939	Jun 18
1940	Apr 30
1941	Apr 24
1942	May 30
1943	May 19
1944	May 4
1945	Jun 17
1946	May 31
1947	Apr 26
1948	May 20
1949	Apr 17
1950	Jun 9
1951	May 13
1952	Apr 13
1953	May 25
1954	May 28
1955	May 28
1956	May 15
1957	May 4
1958	May 1
1959	May 21
1960	May 24
1961	May 14
1962	Jun 7
1963	Apr 29
1964	May 12
1965	May 11
1966	Apr 29
1967	May 15
1968	Jun 30
1969	Apr 28
1970	May 15
1971	May 19
1972	May 13
1973	Jun 19
1974	May 22
1975	May 26
1976	Jun 14
1977	May 21
1978	Jun 1
1979	Jun 9
1980	May 25
1981	May 13
1982	May 11
1983	May 15
1984	May 7
1985	May 14
1986	May 13
1987	Apr 22
1988	May 11
1989	May 20
1990	May 12
1991	May 6
1992	Apr 25
1994	Apr 27
1996	Apr 22
1997	Apr 25
1998	May 5
1999	May 8
2000	May 12
2001	Apr 17
2002	Jun 11
2015	Apr 20
2016	Mar 23
2017	May 18
2019	May 2
2020	May 7
2021	Apr 20
2022	May 10
2023	Apr 25
2024	May 2
2025	Apr 6
2026	Apr 18

Each year's frost-free daysLong-term trend

See the data as a table

Year	Frost-free days
1909	131
1924	135
1925	155
1926	136
1927	125
1928	132
1929	115
1930	125
1931	124
1932	133
1933	123
1934	155
1935	135
1936	131
1937	144
1938	152
1939	81
1940	156
1941	142
1942	111
1943	146
1945	93
1946	107
1947	141
1948	129
1949	153
1950	110
1951	145
1952	184
1953	131
1954	124
1955	130
1956	129
1957	139
1958	146
1959	129
1960	137
1961	130
1962	93
1963	181
1964	130
1965	128
1966	157
1967	144
1968	82
1969	158
1970	122
1971	121
1972	139
1973	106
1974	112
1975	126
1976	112
1977	124
1978	108
1979	133
1980	119
1981	156
1982	147
1983	128
1984	141
1985	131
1986	139
1987	158
1988	161
1989	137
1990	148
1991	151
1992	166
1994	174
1996	146
1997	169
1998	152
1999	141
2000	134
2001	175
2015	198
2016	238
2017	137
2019	151
2020	157
2021	174
2022	162
2023	183
2024	174
2025	204

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

See the data as a table

Year	Growing-season temperature
1906	16.0 °C
1913	16.1 °C
1924	16.4 °C
1925	16.8 °C
1926	16.9 °C
1927	16.1 °C
1928	16.4 °C
1929	16.2 °C
1930	16.9 °C
1931	17.5 °C
1932	16.6 °C
1933	16.6 °C
1934	18.1 °C
1935	16.8 °C
1936	17.6 °C
1937	17.2 °C
1938	16.9 °C
1939	17.3 °C
1940	17.9 °C
1942	16.8 °C
1943	17.5 °C
1944	16.0 °C
1945	15.6 °C
1946	17.3 °C
1947	16.7 °C
1948	16.8 °C
1949	17.0 °C
1950	15.4 °C
1951	16.3 °C
1952	17.5 °C
1953	16.4 °C
1954	17.2 °C
1955	16.5 °C
1956	17.2 °C
1957	16.6 °C
1958	17.7 °C
1959	16.7 °C
1960	17.1 °C
1961	17.0 °C
1962	16.7 °C
1963	17.3 °C
1964	16.2 °C
1965	15.8 °C
1966	17.6 °C
1967	16.6 °C
1968	15.6 °C
1969	17.9 °C
1970	16.2 °C
1971	16.6 °C
1972	16.7 °C
1973	16.2 °C
1974	16.7 °C
1975	15.4 °C
1976	16.7 °C
1977	17.6 °C
1978	16.0 °C
1979	16.6 °C
1980	16.5 °C
1981	17.8 °C
1982	16.1 °C
1983	16.3 °C
1984	17.3 °C
1985	17.6 °C
1986	16.9 °C
1987	17.5 °C
1988	18.0 °C
1989	17.7 °C
1990	17.8 °C
1991	16.4 °C
1992	17.3 °C
1994	19.7 °C
1996	17.3 °C
1997	18.9 °C
1998	17.1 °C
1999	16.8 °C
2000	17.9 °C
2001	18.3 °C
2012	19.0 °C
2015	18.6 °C
2016	19.4 °C
2017	19.0 °C
2019	17.6 °C
2020	18.3 °C
2021	18.8 °C
2022	18.7 °C
2023	18.1 °C
2024	19.1 °C
2025	19.4 °C
2026	19.9 °C

What this means for you: Since 1906, Riverton's last spring frost has come about 2 days earlier per decade, on average. The frost-free season has grown by about 4 days per decade. Year-to-year swings are large, so keep using the safe date rather than the trend.

Source: daily records from Utah Lake Lehi (NOAA GHCN-Daily). Years with too many missing days are left out.

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