When to plant in Stonybrook, PA

Planting dates worked out from Stonybrook'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 28

about a 50% chance of a later one

Average first fall frost

Oct 13

1 year in 10 by Oct 3

Frost-free days

168

median, 1991–2020

Station used: York 3 Ssw Pump Stn · 11.9 km away · station 119 m, town 124 m. How we match towns to stations

This season

Plan your garden.

Build my Stonybrook plan

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 19 – Apr 16	May 13
Bush beans	—	May 3 – May 24	Jun 22
Carrot	—	Apr 7 – May 19	Jun 6
Beet	—	Mar 31 – May 12	May 20
Potato	—	Apr 7 – Apr 28	Jun 16
Kale	Feb 17 – Mar 3	Mar 31 – Apr 14	May 13
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	—	Sep 29 – Oct 27 (fall)	following summer
Spinach	—	Mar 19 – Apr 16	Apr 26
Basil	Mar 29 – Apr 12	May 10 – May 24	Jul 6

Plan all 65 crops for Stonybrook

Stonybrook'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
1894	Apr 16
1895	Apr 24
1896	Apr 9
1897	Apr 21
1898	May 9
1899	Apr 17
1900	May 10
1901	Apr 17
1902	Apr 16
1903	May 2
1916	Apr 16
1917	Apr 17
1918	May 2
1919	Apr 30
1920	May 16
1921	Apr 12
1922	May 1
1923	May 11
1924	May 31
1925	May 26
1926	May 5
1927	Apr 25
1928	May 14
1929	May 11
1930	Apr 24
1931	May 4
1932	May 3
1933	Apr 28
1934	Apr 29
1935	Apr 16
1936	May 15
1937	Apr 17
1938	Apr 25
1939	May 4
1940	May 12
1941	May 13
1942	Apr 22
1943	May 5
1944	Apr 29
1945	May 2
1946	Apr 21
1947	May 11
1948	Apr 30
1949	Apr 29
1950	Apr 22
1951	Apr 24
1952	Apr 12
1953	Apr 22
1954	May 5
1955	Apr 8
1956	May 25
1957	May 5
1958	Apr 13
1959	Apr 24
1960	May 2
1961	May 5
1962	May 10
1963	May 24
1964	Apr 25
1965	Apr 25
1966	May 11
1967	May 25
1968	May 8
1969	May 1
1970	May 7
1971	May 1
1972	May 11
1973	May 18
1974	May 8
1975	Apr 23
1976	May 9
1977	Apr 29
1978	May 1
1979	May 2
1980	Apr 22
1981	May 9
1982	Apr 29
1983	May 17
1984	May 17
1985	May 4
1986	May 4
1987	May 5
1988	Apr 26
1989	Apr 24
1991	Apr 13
1992	Apr 15
1993	Apr 28
1994	May 2
1995	May 8
1996	May 14
1997	May 8
1998	Apr 28
1999	Apr 26
2000	Apr 14
2001	Apr 29
2002	May 22
2003	Apr 14
2004	Apr 16
2005	May 7
2006	May 1
2007	Apr 14
2008	Apr 30
2010	May 10
2014	Apr 21

Each year's frost-free daysLong-term trend

See the data as a table

Year	Frost-free days
1894	181
1895	168
1896	164
1897	165
1898	160
1899	166
1900	159
1901	170
1902	188
1903	176
1916	167
1917	146
1918	158
1919	160
1920	126
1921	183
1922	147
1923	146
1924	130
1925	134
1926	156
1927	172
1928	163
1929	147
1930	160
1931	161
1932	149
1933	168
1934	166
1935	171
1936	133
1937	174
1938	161
1939	164
1940	159
1941	156
1942	159
1943	143
1944	169
1945	154
1946	175
1947	138
1948	156
1949	180
1950	166
1951	157
1952	178
1953	168
1954	155
1955	197
1956	118
1957	144
1958	175
1959	177
1960	171
1961	152
1962	133
1963	121
1964	163
1965	162
1966	148
1967	140
1968	149
1969	166
1970	162
1971	186
1972	151
1973	153
1974	138
1975	162
1976	155
1977	171
1978	150
1979	165
1980	183
1981	152
1982	170
1983	151
1984	169
1985	174
1986	159
1987	156
1988	164
1989	166
1991	183
1992	173
1993	155
1994	161
1995	160
1996	142
1997	146
1998	177
1999	164
2000	177
2001	161
2002	148
2003	171
2004	184
2005	172
2006	164
2007	197
2008	171

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

See the data as a table

Year	Growing-season temperature
1894	18.9 °C
1895	19.2 °C
1896	19.5 °C
1897	18.2 °C
1898	19.3 °C
1899	19.1 °C
1900	20.2 °C
1901	19.9 °C
1902	18.9 °C
1903	18.6 °C
1916	18.6 °C
1917	18.0 °C
1918	19.0 °C
1919	19.0 °C
1920	18.1 °C
1921	19.7 °C
1922	19.5 °C
1923	18.8 °C
1924	17.4 °C
1925	18.9 °C
1926	18.4 °C
1927	17.8 °C
1928	18.3 °C
1929	18.9 °C
1930	19.9 °C
1931	20.0 °C
1932	19.2 °C
1933	20.1 °C
1934	19.9 °C
1935	18.8 °C
1936	19.8 °C
1937	19.1 °C
1938	19.4 °C
1939	19.6 °C
1940	18.0 °C
1941	20.1 °C
1942	20.1 °C
1943	19.9 °C
1944	20.6 °C
1945	20.1 °C
1946	19.3 °C
1947	19.9 °C
1948	19.8 °C
1949	19.9 °C
1950	18.7 °C
1951	19.5 °C
1952	19.9 °C
1953	19.9 °C
1954	19.8 °C
1955	20.5 °C
1956	18.7 °C
1957	20.0 °C
1958	19.1 °C
1959	20.7 °C
1960	19.9 °C
1961	19.3 °C
1962	19.1 °C
1963	18.6 °C
1964	19.1 °C
1965	19.4 °C
1966	18.9 °C
1967	18.4 °C
1968	18.9 °C
1969	19.4 °C
1970	19.5 °C
1971	18.7 °C
1972	18.6 °C
1973	19.4 °C
1974	18.9 °C
1975	18.4 °C
1976	18.7 °C
1977	19.9 °C
1978	19.1 °C
1979	18.6 °C
1980	19.8 °C
1981	19.1 °C
1982	18.4 °C
1983	18.9 °C
1984	18.6 °C
1985	19.2 °C
1986	19.5 °C
1987	20.0 °C
1988	19.7 °C
1989	18.8 °C
1991	20.5 °C
1992	17.6 °C
1993	19.0 °C
1994	19.4 °C
1995	19.3 °C
1996	19.3 °C
1997	18.7 °C
1998	20.2 °C
1999	20.1 °C
2000	19.7 °C
2001	20.1 °C
2002	20.6 °C
2003	19.2 °C
2004	19.9 °C
2005	18.5 °C
2006	20.6 °C
2007	19.9 °C
2008	19.7 °C

What this means for you: Since 1894, Stonybrook's last spring frost has stayed at about the same time of year. Year-to-year swings are large, so keep using the safe date rather than the trend.

Source: daily records from York 3 Ssw Pump Stn (NOAA GHCN-Daily). Years with too many missing days are left out.

Nearby towns

Yorklyn East York Hallam Valley View York North York