When to plant in Prospect, CT
Planting dates worked out from Prospect's own frost records, not a generic zone chart.
Safe to plant out
May 10
1 year in 10 has a later frost
Average last frost
Apr 24
about a 50% chance of a later one
Average first fall frost
Oct 18
1 year in 10 by Oct 3
Frost-free days
182
median, 1991–2020
Station used: Mt Carmel · 12.3 km away · station 53 m, town 268 m. How we match towns to stations
The station sits 215 m lower than the town, so frost dates here may be off by a week or more. Check them against local experience.
This season
Plan your garden.
Planting dates for common crops
| Crop | Start indoors | Plant out or sow | Harvest from |
|---|---|---|---|
| Tomato | Mar 15 – Mar 29 | May 10 – May 24 | Jul 4 |
| Sweet pepper | Mar 1 – Mar 15 | May 10 – May 24 | Jul 9 |
| Lettuce (leaf) | Feb 24 – Mar 3 | Mar 31 – Apr 14 | May 10 |
| Peas | — | Mar 31 – Apr 28 | May 25 |
| Bush beans | — | May 3 – May 24 | Jun 22 |
| Carrot | — | Apr 8 – May 20 | Jun 7 |
| Beet | — | Apr 8 – May 20 | May 28 |
| Potato | — | Apr 8 – Apr 29 | Jun 17 |
| Kale | Feb 24 – Mar 10 | Apr 7 – Apr 21 | May 20 |
| Broccoli | Feb 17 – Mar 3 | Mar 31 – Apr 21 | May 30 |
| Cucumber | Apr 12 – Apr 19 | May 10 – May 24 | Jun 29 |
| Summer squash and zucchini | Apr 12 – Apr 19 | May 10 – May 24 | Jun 24 |
| Winter squash | Apr 12 – Apr 19 | May 10 – May 24 | Jul 29 |
| Sweet corn | — | May 3 – May 24 | Jul 2 |
| Onion (from sets) | — | Mar 31 – Apr 21 | Jun 29 |
| Garlic | — | Oct 4 – Nov 1 (fall) | following summer |
| Spinach | — | Mar 31 – Apr 28 | May 8 |
| Basil | Mar 29 – Apr 12 | May 10 – May 24 | Jul 6 |
Prospect'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 |
|---|---|
| 1936 | May 15 |
| 1937 | Apr 26 |
| 1938 | May 13 |
| 1939 | May 15 |
| 1940 | Apr 29 |
| 1941 | May 13 |
| 1942 | May 11 |
| 1943 | May 2 |
| 1944 | May 19 |
| 1945 | Jun 1 |
| 1946 | May 9 |
| 1947 | May 31 |
| 1948 | May 4 |
| 1949 | Apr 29 |
| 1950 | Apr 17 |
| 1951 | Apr 24 |
| 1952 | Apr 12 |
| 1953 | Apr 29 |
| 1954 | Apr 13 |
| 1955 | Apr 16 |
| 1956 | May 9 |
| 1957 | May 3 |
| 1958 | May 10 |
| 1959 | Apr 24 |
| 1960 | May 3 |
| 1961 | May 31 |
| 1962 | Apr 25 |
| 1964 | May 4 |
| 1965 | Apr 25 |
| 1966 | May 11 |
| 1967 | May 7 |
| 1968 | May 8 |
| 1969 | May 6 |
| 1970 | May 7 |
| 1971 | Apr 25 |
| 1972 | Apr 28 |
| 1973 | Apr 15 |
| 1974 | May 8 |
| 1975 | Apr 23 |
| 1976 | May 13 |
| 1977 | Apr 30 |
| 1978 | May 1 |
| 1979 | Apr 20 |
| 1980 | Apr 19 |
| 1981 | May 9 |
| 1982 | Apr 23 |
| 1983 | Apr 14 |
| 1984 | Apr 22 |
| 1985 | May 9 |
| 1986 | May 4 |
| 1987 | May 14 |
| 1988 | Apr 23 |
| 1989 | Apr 23 |
| 1990 | Apr 19 |
| 1991 | Apr 19 |
| 1995 | Apr 17 |
| 1996 | May 14 |
| 1999 | Apr 20 |
| 2000 | May 16 |
| 2001 | May 8 |
| 2002 | May 1 |
| 2003 | Apr 25 |
| 2004 | Apr 10 |
| 2005 | Apr 17 |
| 2006 | Apr 11 |
| 2007 | May 8 |
| 2009 | Apr 17 |
| 2010 | Apr 28 |
| 2011 | Apr 10 |
| 2012 | Apr 30 |
| 2015 | Apr 25 |
| 2016 | Apr 15 |
| 2017 | Apr 9 |
| 2018 | Apr 18 |
| 2019 | Apr 11 |
| 2020 | May 10 |
| 2021 | Apr 22 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1936 | 150 |
| 1937 | 147 |
| 1938 | 144 |
| 1939 | 152 |
| 1940 | 150 |
| 1941 | 151 |
| 1942 | 140 |
| 1943 | 147 |
| 1944 | 128 |
| 1945 | 121 |
| 1946 | 145 |
| 1947 | 114 |
| 1948 | 152 |
| 1949 | 180 |
| 1950 | 159 |
| 1951 | 171 |
| 1952 | 182 |
| 1953 | 162 |
| 1954 | 177 |
| 1955 | 189 |
| 1956 | 134 |
| 1957 | 146 |
| 1958 | 148 |
| 1959 | 146 |
| 1960 | 157 |
| 1961 | 126 |
| 1962 | 182 |
| 1964 | 154 |
| 1965 | 155 |
| 1966 | 148 |
| 1967 | 165 |
| 1968 | 150 |
| 1969 | 165 |
| 1970 | 163 |
| 1971 | 193 |
| 1972 | 164 |
| 1973 | 186 |
| 1974 | 138 |
| 1975 | 162 |
| 1976 | 150 |
| 1977 | 170 |
| 1978 | 160 |
| 1979 | 152 |
| 1980 | 173 |
| 1981 | 157 |
| 1982 | 170 |
| 1983 | 189 |
| 1984 | 167 |
| 1985 | 165 |
| 1986 | 159 |
| 1987 | 143 |
| 1988 | 168 |
| 1989 | 157 |
| 1990 | 183 |
| 1991 | 184 |
| 1995 | 182 |
| 1996 | 142 |
| 1999 | 168 |
| 2000 | 135 |
| 2002 | 166 |
| 2003 | 160 |
| 2005 | 192 |
| 2006 | 185 |
| 2007 | 174 |
| 2009 | 185 |
| 2010 | 177 |
| 2011 | 200 |
| 2015 | 175 |
| 2016 | 192 |
| 2017 | 213 |
| 2018 | 183 |
| 2019 | 190 |
| 2020 | 173 |
| 2021 | 194 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1944 | 16.6 °C |
| 1946 | 15.0 °C |
| 1947 | 15.8 °C |
| 1948 | 16.3 °C |
| 1949 | 17.8 °C |
| 1950 | 15.4 °C |
| 1951 | 17.0 °C |
| 1952 | 17.5 °C |
| 1953 | 17.9 °C |
| 1954 | 16.8 °C |
| 1955 | 17.8 °C |
| 1956 | 16.3 °C |
| 1957 | 17.9 °C |
| 1958 | 16.4 °C |
| 1959 | 18.0 °C |
| 1960 | 17.1 °C |
| 1961 | 17.4 °C |
| 1962 | 16.7 °C |
| 1964 | 16.9 °C |
| 1965 | 17.1 °C |
| 1966 | 16.5 °C |
| 1967 | 16.4 °C |
| 1968 | 17.4 °C |
| 1969 | 17.5 °C |
| 1970 | 17.6 °C |
| 1971 | 17.1 °C |
| 1972 | 16.9 °C |
| 1973 | 17.8 °C |
| 1974 | 17.3 °C |
| 1975 | 17.3 °C |
| 1976 | 17.8 °C |
| 1977 | 18.0 °C |
| 1978 | 17.3 °C |
| 1979 | 17.9 °C |
| 1980 | 18.6 °C |
| 1981 | 18.3 °C |
| 1982 | 17.2 °C |
| 1987 | 18.8 °C |
| 1988 | 18.4 °C |
| 1989 | 18.4 °C |
| 1990 | 18.0 °C |
| 1991 | 19.0 °C |
| 1995 | 18.1 °C |
| 1996 | 17.7 °C |
| 1999 | 18.9 °C |
| 2000 | 16.2 °C |
| 2002 | 18.5 °C |
| 2003 | 17.2 °C |
| 2004 | 17.9 °C |
| 2005 | 18.7 °C |
| 2006 | 18.2 °C |
| 2007 | 18.2 °C |
| 2009 | 17.6 °C |
| 2010 | 19.6 °C |
| 2011 | 18.7 °C |
| 2015 | 18.9 °C |
| 2016 | 18.9 °C |
| 2017 | 18.6 °C |
| 2018 | 19.0 °C |
| 2019 | 18.4 °C |
| 2020 | 18.5 °C |
| 2021 | 18.8 °C |
What this means for you: Since 1936, Prospect's last spring frost has come about 2 days earlier per decade, on average. The frost-free season has grown by about 5 days per decade. Year-to-year swings are large, so keep using the safe date rather than the trend.
Source: daily records from Mt Carmel (NOAA GHCN-Daily). Years with too many missing days are left out.