When to plant in Williston, VT
Planting dates worked out from Williston's own frost records, not a generic zone chart.
Safe to plant out
May 14
1 year in 10 has a later frost
Average last frost
May 3
about a 50% chance of a later one
Average first fall frost
Oct 9
1 year in 10 by Sep 28
Frost-free days
159
median, 1991–2020
Station used: Burlington Intl Ap · 7.3 km away · station 101 m, town 151 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 | Mar 19 – Apr 2 | May 14 – May 28 | Jul 8 |
| Sweet pepper | Mar 5 – Mar 19 | May 14 – May 28 | Jul 13 |
| Lettuce (leaf) | Mar 6 – Mar 13 | Apr 10 – Apr 24 | May 20 |
| Peas | — | Apr 10 – May 8 | Jun 4 |
| Bush beans | — | May 7 – May 28 | Jun 26 |
| Carrot | — | Apr 20 – Jun 1 | Jun 19 |
| Beet | — | Apr 20 – Jun 1 | Jun 9 |
| Potato | — | Apr 20 – May 11 | Jun 29 |
| Kale | Mar 6 – Mar 20 | Apr 17 – May 1 | May 30 |
| Broccoli | Feb 27 – Mar 13 | Apr 10 – May 1 | Jun 9 |
| Cucumber | Apr 16 – Apr 23 | May 14 – May 28 | Jul 3 |
| Summer squash and zucchini | Apr 16 – Apr 23 | May 14 – May 28 | Jun 28 |
| Winter squash | Apr 16 – Apr 23 | May 14 – May 28 | Aug 2 |
| Sweet corn | — | May 7 – May 28 | Jul 6 |
| Onion (from sets) | — | Apr 10 – May 1 | Jul 9 |
| Garlic | — | Sep 25 – Oct 23 (fall) | following summer |
| Spinach | — | Apr 10 – May 8 | May 18 |
| Basil | Apr 2 – Apr 16 | May 14 – May 28 | Jul 10 |
Williston'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 |
|---|---|
| 1941 | May 13 |
| 1942 | May 11 |
| 1943 | May 14 |
| 1944 | May 20 |
| 1945 | May 20 |
| 1946 | May 4 |
| 1947 | May 15 |
| 1948 | May 3 |
| 1949 | May 11 |
| 1950 | May 14 |
| 1951 | May 14 |
| 1952 | May 5 |
| 1953 | Apr 20 |
| 1954 | May 6 |
| 1955 | Apr 28 |
| 1956 | May 25 |
| 1957 | May 17 |
| 1958 | May 10 |
| 1959 | May 9 |
| 1960 | Apr 29 |
| 1961 | May 31 |
| 1962 | May 12 |
| 1963 | May 24 |
| 1964 | May 21 |
| 1965 | May 24 |
| 1966 | May 14 |
| 1967 | May 23 |
| 1968 | May 8 |
| 1969 | May 27 |
| 1970 | May 8 |
| 1971 | May 24 |
| 1972 | May 11 |
| 1973 | May 15 |
| 1974 | May 20 |
| 1975 | Apr 29 |
| 1976 | Apr 24 |
| 1977 | May 8 |
| 1978 | May 1 |
| 1979 | May 7 |
| 1980 | Apr 22 |
| 1981 | May 19 |
| 1982 | May 11 |
| 1983 | May 18 |
| 1984 | May 17 |
| 1985 | May 9 |
| 1986 | May 4 |
| 1987 | May 19 |
| 1988 | Apr 26 |
| 1989 | Apr 29 |
| 1990 | May 12 |
| 1991 | Apr 19 |
| 1992 | May 25 |
| 1993 | May 14 |
| 1994 | May 3 |
| 1995 | May 7 |
| 1996 | May 7 |
| 1997 | May 5 |
| 1998 | Apr 27 |
| 1999 | May 13 |
| 2000 | May 1 |
| 2001 | May 6 |
| 2002 | May 20 |
| 2003 | May 4 |
| 2004 | May 8 |
| 2005 | May 13 |
| 2006 | Apr 30 |
| 2007 | May 5 |
| 2008 | May 1 |
| 2009 | Apr 24 |
| 2010 | May 13 |
| 2011 | Apr 22 |
| 2012 | Apr 30 |
| 2013 | May 15 |
| 2014 | Apr 25 |
| 2015 | Apr 16 |
| 2016 | Apr 29 |
| 2017 | Apr 15 |
| 2018 | Apr 23 |
| 2019 | Apr 17 |
| 2020 | May 9 |
| 2021 | Apr 27 |
| 2022 | Apr 30 |
| 2023 | May 18 |
| 2024 | Apr 26 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1941 | 122 |
| 1942 | 140 |
| 1943 | 144 |
| 1944 | 134 |
| 1945 | 132 |
| 1946 | 131 |
| 1947 | 132 |
| 1948 | 152 |
| 1949 | 143 |
| 1950 | 133 |
| 1951 | 138 |
| 1952 | 157 |
| 1953 | 156 |
| 1954 | 153 |
| 1955 | 147 |
| 1956 | 133 |
| 1957 | 147 |
| 1958 | 148 |
| 1959 | 132 |
| 1960 | 155 |
| 1961 | 121 |
| 1962 | 131 |
| 1963 | 112 |
| 1964 | 114 |
| 1965 | 125 |
| 1966 | 150 |
| 1967 | 136 |
| 1968 | 150 |
| 1969 | 125 |
| 1970 | 163 |
| 1971 | 141 |
| 1972 | 139 |
| 1973 | 128 |
| 1974 | 126 |
| 1975 | 158 |
| 1976 | 169 |
| 1977 | 151 |
| 1978 | 147 |
| 1979 | 135 |
| 1980 | 158 |
| 1981 | 134 |
| 1982 | 152 |
| 1983 | 144 |
| 1984 | 140 |
| 1985 | 155 |
| 1986 | 158 |
| 1987 | 130 |
| 1988 | 155 |
| 1989 | 163 |
| 1990 | 160 |
| 1991 | 163 |
| 1992 | 121 |
| 1993 | 128 |
| 1994 | 160 |
| 1995 | 144 |
| 1996 | 149 |
| 1997 | 159 |
| 1998 | 159 |
| 1999 | 145 |
| 2000 | 149 |
| 2001 | 154 |
| 2002 | 146 |
| 2003 | 155 |
| 2004 | 150 |
| 2005 | 160 |
| 2006 | 173 |
| 2007 | 160 |
| 2008 | 158 |
| 2009 | 170 |
| 2010 | 149 |
| 2011 | 166 |
| 2012 | 165 |
| 2013 | 161 |
| 2014 | 146 |
| 2015 | 181 |
| 2016 | 168 |
| 2017 | 184 |
| 2018 | 185 |
| 2019 | 170 |
| 2020 | 152 |
| 2021 | 179 |
| 2022 | 180 |
| 2023 | 165 |
| 2024 | 173 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1941 | 16.3 °C |
| 1942 | 16.5 °C |
| 1943 | 15.1 °C |
| 1944 | 16.6 °C |
| 1945 | 16.4 °C |
| 1946 | 15.2 °C |
| 1947 | 16.1 °C |
| 1948 | 16.0 °C |
| 1949 | 17.2 °C |
| 1950 | 15.2 °C |
| 1951 | 15.6 °C |
| 1952 | 16.2 °C |
| 1953 | 16.3 °C |
| 1954 | 15.0 °C |
| 1955 | 17.1 °C |
| 1956 | 14.2 °C |
| 1957 | 15.7 °C |
| 1958 | 14.9 °C |
| 1959 | 17.1 °C |
| 1960 | 15.8 °C |
| 1961 | 15.0 °C |
| 1962 | 14.4 °C |
| 1963 | 14.1 °C |
| 1964 | 14.9 °C |
| 1965 | 14.6 °C |
| 1966 | 14.7 °C |
| 1967 | 14.7 °C |
| 1968 | 14.8 °C |
| 1969 | 14.7 °C |
| 1970 | 15.6 °C |
| 1971 | 15.2 °C |
| 1972 | 14.5 °C |
| 1973 | 16.2 °C |
| 1974 | 15.5 °C |
| 1975 | 16.3 °C |
| 1976 | 15.8 °C |
| 1977 | 16.1 °C |
| 1978 | 15.2 °C |
| 1979 | 15.9 °C |
| 1980 | 16.4 °C |
| 1981 | 16.4 °C |
| 1982 | 15.5 °C |
| 1983 | 16.0 °C |
| 1984 | 15.7 °C |
| 1985 | 15.5 °C |
| 1986 | 15.7 °C |
| 1987 | 16.3 °C |
| 1988 | 16.3 °C |
| 1989 | 16.4 °C |
| 1990 | 16.0 °C |
| 1991 | 16.8 °C |
| 1992 | 15.3 °C |
| 1993 | 16.4 °C |
| 1994 | 16.3 °C |
| 1995 | 16.4 °C |
| 1996 | 15.8 °C |
| 1997 | 15.0 °C |
| 1998 | 16.8 °C |
| 1999 | 17.6 °C |
| 2000 | 15.3 °C |
| 2001 | 16.6 °C |
| 2002 | 16.5 °C |
| 2003 | 16.4 °C |
| 2004 | 15.8 °C |
| 2005 | 17.1 °C |
| 2006 | 16.6 °C |
| 2007 | 16.4 °C |
| 2008 | 16.5 °C |
| 2009 | 16.0 °C |
| 2010 | 17.5 °C |
| 2011 | 17.3 °C |
| 2012 | 17.7 °C |
| 2013 | 17.0 °C |
| 2014 | 16.9 °C |
| 2015 | 17.9 °C |
| 2016 | 17.5 °C |
| 2017 | 17.4 °C |
| 2018 | 18.0 °C |
| 2019 | 16.9 °C |
| 2020 | 17.5 °C |
| 2021 | 18.1 °C |
| 2022 | 17.8 °C |
| 2023 | 17.8 °C |
| 2024 | 18.6 °C |
What this means for you: Since 1941, Williston'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 Burlington Intl Ap (NOAA GHCN-Daily). Years with too many missing days are left out.