When to plant in Delta, UT
Planting dates worked out from Delta's own frost records, not a generic zone chart.
Safe to plant out
Jun 10
1 year in 10 has a later frost
Average last frost
May 20
about a 50% chance of a later one
Average first fall frost
Sep 25
1 year in 10 by Sep 12
Frost-free days
132
median, 1991–2020
Station used: Delta · 1.8 km away · station 1408 m, town 1414 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 15 – Apr 29 | Jun 10 – Jun 24 | Aug 4 |
| Sweet pepper | Apr 1 – Apr 15 | Jun 10 – Jun 24 | Aug 9 |
| Lettuce (leaf) | Mar 18 – Mar 25 | Apr 22 – May 6 | Jun 1 |
| Peas | — | Apr 8 – May 6 | Jun 2 |
| Bush beans | — | Jun 3 – Jun 24 | Jul 23 |
| Carrot | — | Apr 29 – Jun 10 | Jun 28 |
| Beet | — | Apr 22 – Jun 3 | Jun 11 |
| Potato | — | Apr 29 – May 20 | Jul 8 |
| Kale | Mar 11 – Mar 25 | Apr 22 – May 6 | Jun 4 |
| Broccoli | Mar 11 – Mar 25 | Apr 22 – May 13 | Jun 21 |
| Cucumber | May 13 – May 20 | Jun 10 – Jun 24 | Jul 30 |
| Summer squash and zucchini | May 13 – May 20 | Jun 10 – Jun 24 | Jul 25 |
| Winter squash | May 13 – May 20 | Jun 10 – Jun 24 | Aug 29 |
| Sweet corn | — | Jun 3 – Jun 24 | Aug 2 |
| Onion (from sets) | — | Apr 22 – May 13 | Jul 21 |
| Garlic | — | Sep 11 – Oct 9 (fall) | following summer |
| Spinach | — | Apr 8 – May 6 | May 16 |
| Basil | Apr 29 – May 13 | Jun 10 – Jun 24 | Aug 6 |
Delta'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 |
|---|---|
| 1939 | Jun 18 |
| 1941 | May 20 |
| 1942 | May 14 |
| 1943 | Jun 3 |
| 1944 | May 4 |
| 1945 | Apr 27 |
| 1946 | May 2 |
| 1947 | Apr 24 |
| 1948 | May 20 |
| 1950 | May 8 |
| 1951 | Jun 3 |
| 1952 | Apr 15 |
| 1953 | May 13 |
| 1954 | May 28 |
| 1955 | May 16 |
| 1956 | May 15 |
| 1957 | Apr 26 |
| 1958 | Apr 27 |
| 1959 | May 20 |
| 1960 | May 22 |
| 1961 | May 5 |
| 1962 | May 21 |
| 1963 | Apr 29 |
| 1964 | May 9 |
| 1965 | May 11 |
| 1966 | May 12 |
| 1967 | May 15 |
| 1971 | May 19 |
| 1972 | May 21 |
| 1973 | Jun 19 |
| 1974 | May 21 |
| 1975 | May 26 |
| 1976 | Jun 15 |
| 1978 | May 31 |
| 1979 | Jun 9 |
| 1980 | May 26 |
| 1981 | Jun 15 |
| 1982 | Jun 6 |
| 1983 | May 20 |
| 1984 | May 8 |
| 1985 | May 14 |
| 1986 | May 23 |
| 1987 | May 3 |
| 1988 | May 8 |
| 1989 | May 20 |
| 1990 | May 9 |
| 1991 | May 19 |
| 1992 | May 10 |
| 1993 | May 9 |
| 1994 | May 8 |
| 1995 | May 13 |
| 1996 | Apr 30 |
| 1997 | May 26 |
| 1998 | May 22 |
| 1999 | May 17 |
| 2000 | May 13 |
| 2001 | Jun 14 |
| 2002 | Jun 10 |
| 2003 | May 21 |
| 2004 | Jun 11 |
| 2005 | Apr 30 |
| 2007 | May 30 |
| 2008 | May 13 |
| 2009 | May 14 |
| 2010 | May 14 |
| 2011 | Jun 3 |
| 2012 | Jun 10 |
| 2018 | Apr 21 |
| 2020 | Jun 8 |
| 2021 | May 24 |
| 2022 | May 22 |
| 2023 | May 7 |
| 2024 | May 22 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1939 | 113 |
| 1941 | 130 |
| 1942 | 127 |
| 1944 | 151 |
| 1945 | 149 |
| 1946 | 138 |
| 1947 | 181 |
| 1948 | 129 |
| 1950 | 145 |
| 1951 | 110 |
| 1952 | 182 |
| 1953 | 142 |
| 1954 | 138 |
| 1955 | 132 |
| 1956 | 129 |
| 1957 | 147 |
| 1958 | 150 |
| 1959 | 130 |
| 1960 | 145 |
| 1961 | 141 |
| 1962 | 145 |
| 1963 | 181 |
| 1964 | 133 |
| 1965 | 128 |
| 1966 | 125 |
| 1967 | 144 |
| 1971 | 121 |
| 1972 | 131 |
| 1973 | 74 |
| 1974 | 113 |
| 1975 | 134 |
| 1976 | 110 |
| 1978 | 109 |
| 1979 | 133 |
| 1980 | 118 |
| 1981 | 115 |
| 1982 | 117 |
| 1983 | 123 |
| 1984 | 139 |
| 1985 | 131 |
| 1986 | 120 |
| 1987 | 148 |
| 1988 | 126 |
| 1989 | 136 |
| 1990 | 146 |
| 1991 | 138 |
| 1992 | 138 |
| 1993 | 127 |
| 1994 | 163 |
| 1995 | 131 |
| 1996 | 141 |
| 1997 | 137 |
| 1998 | 134 |
| 1999 | 133 |
| 2000 | 133 |
| 2001 | 84 |
| 2002 | 100 |
| 2003 | 115 |
| 2004 | 84 |
| 2005 | 152 |
| 2007 | 117 |
| 2008 | 132 |
| 2009 | 130 |
| 2010 | 119 |
| 2011 | 124 |
| 2012 | 115 |
| 2018 | 170 |
| 2021 | 119 |
| 2022 | 144 |
| 2023 | 158 |
| 2024 | 149 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1939 | 18.9 °C |
| 1941 | 17.2 °C |
| 1942 | 17.9 °C |
| 1944 | 17.6 °C |
| 1945 | 17.0 °C |
| 1946 | 19.0 °C |
| 1947 | 18.2 °C |
| 1948 | 18.4 °C |
| 1949 | 19.0 °C |
| 1950 | 17.7 °C |
| 1951 | 18.2 °C |
| 1952 | 19.0 °C |
| 1953 | 17.9 °C |
| 1954 | 19.4 °C |
| 1955 | 18.1 °C |
| 1956 | 19.1 °C |
| 1957 | 18.0 °C |
| 1958 | 19.2 °C |
| 1959 | 18.7 °C |
| 1960 | 19.5 °C |
| 1961 | 18.8 °C |
| 1962 | 18.5 °C |
| 1963 | 18.7 °C |
| 1964 | 17.6 °C |
| 1965 | 16.5 °C |
| 1966 | 18.6 °C |
| 1967 | 17.3 °C |
| 1971 | 17.3 °C |
| 1972 | 17.9 °C |
| 1973 | 17.7 °C |
| 1974 | 18.1 °C |
| 1975 | 16.1 °C |
| 1976 | 17.5 °C |
| 1978 | 16.6 °C |
| 1979 | 17.8 °C |
| 1980 | 17.2 °C |
| 1981 | 18.6 °C |
| 1982 | 16.7 °C |
| 1983 | 16.9 °C |
| 1984 | 17.4 °C |
| 1985 | 18.2 °C |
| 1986 | 17.5 °C |
| 1987 | 18.3 °C |
| 1988 | 18.1 °C |
| 1989 | 18.2 °C |
| 1990 | 18.8 °C |
| 1991 | 17.3 °C |
| 1992 | 18.8 °C |
| 1993 | 16.8 °C |
| 1994 | 19.5 °C |
| 1995 | 16.8 °C |
| 1996 | 18.2 °C |
| 1997 | 18.0 °C |
| 1998 | 17.7 °C |
| 1999 | 17.2 °C |
| 2000 | 19.2 °C |
| 2001 | 19.0 °C |
| 2002 | 17.9 °C |
| 2003 | 17.8 °C |
| 2004 | 17.5 °C |
| 2005 | 18.0 °C |
| 2007 | 19.3 °C |
| 2008 | 17.8 °C |
| 2009 | 18.0 °C |
| 2010 | 17.8 °C |
| 2011 | 17.6 °C |
| 2012 | 18.9 °C |
| 2013 | 18.2 °C |
| 2017 | 19.3 °C |
| 2018 | 19.2 °C |
| 2020 | 19.6 °C |
| 2021 | 20.2 °C |
| 2022 | 19.6 °C |
| 2023 | 18.6 °C |
| 2024 | 19.7 °C |
What this means for you: Since 1939, Delta's last spring frost has come about 1 day later per decade, on average. The frost-free season has shrunk by about 1 days per decade. Year-to-year swings are large, so keep using the safe date rather than the trend.
Source: daily records from Delta (NOAA GHCN-Daily). Years with too many missing days are left out.