When to plant in Kulpsville, PA
Planting dates worked out from Kulpsville's own frost records, not a generic zone chart.
Safe to plant out
May 21
1 year in 10 has a later frost
Average last frost
Apr 28
about a 50% chance of a later one
Average first fall frost
Oct 10
1 year in 10 by Sep 25
Frost-free days
167
median, 1991–2020
Station used: Graterford 1 E · 7.6 km away · station 85 m, town 88 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 26 – Apr 9 | May 21 – Jun 4 | Jul 15 |
| Sweet pepper | Mar 12 – Mar 26 | May 21 – Jun 4 | Jul 20 |
| Lettuce (leaf) | Feb 24 – Mar 3 | Mar 31 – Apr 14 | May 10 |
| Peas | — | Mar 28 – Apr 25 | May 22 |
| Bush beans | — | May 14 – Jun 4 | Jul 3 |
| Carrot | — | Apr 7 – May 19 | Jun 6 |
| Beet | — | Apr 6 – May 18 | May 26 |
| Potato | — | Apr 7 – Apr 28 | Jun 16 |
| Kale | Feb 21 – Mar 7 | Apr 4 – Apr 18 | May 17 |
| Broccoli | Feb 17 – Mar 3 | Mar 31 – Apr 21 | May 30 |
| Cucumber | Apr 23 – Apr 30 | May 21 – Jun 4 | Jul 10 |
| Summer squash and zucchini | Apr 23 – Apr 30 | May 21 – Jun 4 | Jul 5 |
| Winter squash | Apr 23 – Apr 30 | May 21 – Jun 4 | Aug 9 |
| Sweet corn | — | May 14 – Jun 4 | Jul 13 |
| Onion (from sets) | — | Mar 31 – Apr 21 | Jun 29 |
| Garlic | — | Sep 26 – Oct 24 (fall) | following summer |
| Spinach | — | Mar 28 – Apr 25 | May 5 |
| Basil | Apr 9 – Apr 23 | May 21 – Jun 4 | Jul 17 |
Kulpsville'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 |
|---|---|
| 1961 | Apr 21 |
| 1962 | May 10 |
| 1963 | May 24 |
| 1964 | Apr 11 |
| 1965 | Apr 17 |
| 1966 | May 12 |
| 1967 | May 13 |
| 1968 | May 8 |
| 1969 | Apr 14 |
| 1970 | Apr 16 |
| 1973 | Mar 28 |
| 1975 | Apr 23 |
| 1976 | Apr 13 |
| 1977 | Apr 29 |
| 1982 | Apr 15 |
| 1983 | May 18 |
| 1984 | May 17 |
| 1985 | Apr 12 |
| 1986 | May 4 |
| 1987 | Jun 11 |
| 1988 | Apr 26 |
| 1989 | Apr 25 |
| 1990 | Apr 20 |
| 1991 | Apr 13 |
| 1992 | May 21 |
| 1993 | May 21 |
| 1994 | May 28 |
| 1995 | May 9 |
| 1997 | May 8 |
| 1998 | Apr 13 |
| 1999 | May 21 |
| 2001 | Apr 26 |
| 2002 | Apr 30 |
| 2003 | Apr 19 |
| 2004 | Apr 17 |
| 2005 | May 2 |
| 2006 | Apr 9 |
| 2007 | Apr 12 |
| 2008 | May 2 |
| 2011 | Apr 6 |
| 2012 | Apr 30 |
| 2013 | May 14 |
| 2014 | Apr 25 |
| 2015 | Apr 25 |
| 2016 | Apr 16 |
| 2017 | Apr 10 |
| 2018 | May 2 |
| 2019 | Apr 29 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1961 | 166 |
| 1962 | 167 |
| 1963 | 122 |
| 1964 | 177 |
| 1965 | 171 |
| 1966 | 153 |
| 1967 | 159 |
| 1969 | 191 |
| 1973 | 224 |
| 1975 | 190 |
| 1976 | 181 |
| 1982 | 178 |
| 1984 | 121 |
| 1985 | 199 |
| 1986 | 159 |
| 1987 | 73 |
| 1988 | 165 |
| 1989 | 155 |
| 1990 | 182 |
| 1991 | 167 |
| 1992 | 131 |
| 1993 | 121 |
| 1994 | 127 |
| 1995 | 124 |
| 1998 | 163 |
| 1999 | 132 |
| 2002 | 167 |
| 2004 | 171 |
| 2005 | 178 |
| 2006 | 186 |
| 2007 | 183 |
| 2011 | 206 |
| 2012 | 165 |
| 2013 | 159 |
| 2014 | 162 |
| 2015 | 175 |
| 2016 | 177 |
| 2017 | 199 |
| 2018 | 169 |
| 2019 | 172 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1961 | 17.9 °C |
| 1962 | 17.4 °C |
| 1963 | 17.2 °C |
| 1964 | 17.5 °C |
| 1965 | 17.7 °C |
| 1966 | 17.7 °C |
| 1967 | 16.9 °C |
| 1969 | 19.1 °C |
| 1970 | 19.6 °C |
| 1973 | 19.9 °C |
| 1975 | 17.9 °C |
| 1976 | 18.6 °C |
| 1981 | 18.4 °C |
| 1983 | 18.0 °C |
| 1984 | 16.5 °C |
| 1985 | 18.1 °C |
| 1986 | 17.7 °C |
| 1987 | 15.1 °C |
| 1988 | 17.5 °C |
| 1989 | 17.5 °C |
| 1990 | 17.6 °C |
| 1991 | 18.6 °C |
| 1992 | 15.9 °C |
| 1993 | 17.2 °C |
| 1994 | 17.1 °C |
| 1995 | 16.9 °C |
| 1997 | 17.2 °C |
| 1998 | 18.3 °C |
| 1999 | 17.6 °C |
| 2000 | 17.3 °C |
| 2002 | 19.4 °C |
| 2004 | 19.2 °C |
| 2005 | 19.8 °C |
| 2006 | 19.6 °C |
| 2007 | 19.9 °C |
| 2009 | 18.2 °C |
| 2011 | 19.5 °C |
| 2012 | 19.2 °C |
| 2013 | 18.4 °C |
| 2014 | 18.0 °C |
| 2015 | 19.4 °C |
| 2016 | 19.4 °C |
| 2017 | 18.7 °C |
| 2018 | 19.6 °C |
| 2019 | 19.9 °C |
What this means for you: Since 1961, Kulpsville's last spring frost has stayed at about the same time of year. The frost-free season has grown 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 Graterford 1 E (NOAA GHCN-Daily). Years with too many missing days are left out.