When to plant in Union Hill-Novelty Hill, WA

Planting dates worked out from Union Hill-Novelty Hill's own frost records, not a generic zone chart.

Safe to plant out

May 7

1 year in 10 has a later frost

Average last frost

Apr 13

about a 50% chance of a later one

Average first fall frost

Oct 29

1 year in 10 by Oct 15

Frost-free days

208

median, 1991–2020

Station used: Snoqualmie Falls · 21.0 km away · station 134 m, town 168 m. How we match towns to stations

This season

Plan your garden.

Build my Union Hill-Novelty Hill plan

Planting dates for common crops

Crop	Start indoors	Plant out or sow	Harvest from
Tomato	Mar 17 – Mar 31	May 12 – May 26	Jul 6
Sweet pepper	Mar 3 – Mar 17	May 12 – May 26	Jul 11
Lettuce (leaf)	Feb 9 – Feb 16	Mar 16 – Mar 30	Apr 25
Peas	—	Mar 2 – Mar 30	Apr 26
Bush beans	—	May 3 – May 24	Jun 22
Carrot	—	Apr 2 – May 14	Jun 1
Beet	—	Apr 2 – May 14	May 22
Potato	—	Apr 2 – Apr 23	Jun 11
Kale	Feb 2 – Feb 16	Mar 16 – Mar 30	Apr 28
Broccoli	Feb 2 – Feb 16	Mar 16 – Apr 6	May 15
Cucumber	Apr 14 – Apr 21	May 12 – May 26	Jul 1
Summer squash and zucchini	Apr 14 – Apr 21	May 12 – May 26	Jun 26
Winter squash	Apr 14 – Apr 21	May 12 – May 26	Jul 31
Sweet corn	—	May 3 – May 24	Jul 2
Onion (from sets)	—	Mar 16 – Apr 6	Jun 14
Garlic	—	Oct 6 – Nov 3 (fall)	following summer
Spinach	—	Mar 2 – Mar 30	Apr 9
Basil	Mar 31 – Apr 14	May 12 – May 26	Jul 8

Plan all 65 crops for Union Hill-Novelty Hill

Union Hill-Novelty Hill'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
1899	Mar 26
1900	Mar 30
1902	Apr 30
1903	May 3
1904	May 10
1905	May 1
1906	Apr 12
1907	May 1
1908	Apr 28
1909	Apr 22
1910	Apr 30
1911	Apr 27
1912	Apr 5
1913	Apr 30
1914	Apr 29
1915	Apr 21
1916	May 13
1917	Apr 22
1918	Apr 26
1919	Apr 15
1920	Apr 24
1921	Apr 8
1922	Apr 12
1923	Mar 27
1924	Apr 24
1925	May 3
1926	Apr 23
1927	May 6
1928	Apr 7
1929	May 17
1930	Jun 18
1931	May 9
1932	May 26
1933	Jun 10
1934	Apr 3
1935	May 25
1936	Apr 4
1938	May 14
1939	Jun 1
1940	May 27
1941	May 9
1942	May 12
1943	May 8
1944	May 10
1945	Apr 28
1946	May 6
1947	Jun 11
1948	May 2
1949	May 5
1950	May 24
1951	May 1
1952	May 5
1953	May 31
1954	May 28
1955	May 4
1956	May 13
1957	Apr 9
1958	May 13
1959	May 5
1960	Apr 16
1961	Apr 20
1962	Apr 11
1963	May 4
1964	May 15
1965	May 8
1966	Apr 19
1967	Apr 27
1968	Apr 17
1969	May 4
1970	Apr 16
1971	Apr 19
1972	May 1
1973	Apr 29
1974	Apr 16
1975	May 23
1976	Jun 2
1977	Apr 19
1978	Apr 6
1979	Mar 30
1980	Apr 10
1981	Apr 17
1982	May 4
1983	Apr 14
1984	Apr 25
1985	May 8
1986	Apr 29
1987	Apr 20
1988	Apr 25
1989	Mar 20
1990	May 6
1991	Apr 12
1992	Apr 11
1993	Mar 28
1994	Mar 26
1995	Apr 22
1997	Apr 5
1998	Apr 15
1999	May 10
2000	Mar 31
2001	May 6
2002	May 8
2003	Apr 4
2004	Apr 2
2005	Apr 16
2006	Mar 21
2007	Apr 16
2008	Apr 22

Each year's frost-free daysLong-term trend

See the data as a table

Year	Frost-free days
1900	233
1902	185
1904	206
1905	169
1906	191
1907	191
1908	149
1909	177
1910	178
1911	149
1912	183
1913	157
1914	199
1915	200
1916	142
1917	178
1918	193
1919	192
1920	188
1921	197
1922	199
1923	209
1924	201
1925	151
1926	153
1927	178
1928	153
1929	132
1930	113
1931	146
1932	117
1933	106
1934	174
1935	137
1936	164
1938	152
1939	144
1940	147
1941	172
1942	152
1943	164
1944	183
1945	151
1946	156
1947	150
1948	144
1949	155
1950	129
1951	176
1952	161
1953	115
1954	124
1955	180
1956	163
1957	177
1958	160
1959	177
1960	175
1961	179
1962	220
1963	167
1964	164
1965	198
1966	179
1967	188
1968	173
1969	161
1970	179
1971	179
1972	180
1973	156
1974	170
1975	152
1977	196
1978	201
1979	213
1980	193
1981	175
1983	165
1984	137
1985	151
1986	193
1987	180
1988	183
1989	207
1990	182
1991	198
1992	186
1993	221
1994	221
1997	220
1998	186
1999	158
2000	223
2001	174
2002	156
2003	208
2004	215
2005	212
2006	222
2007	192

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

See the data as a table

Year	Growing-season temperature
1899	15.0 °C
1900	17.4 °C
1901	12.8 °C
1902	14.2 °C
1904	14.8 °C
1905	15.1 °C
1906	15.5 °C
1907	14.9 °C
1908	14.5 °C
1909	14.1 °C
1910	14.9 °C
1911	14.4 °C
1912	15.1 °C
1913	15.3 °C
1914	15.4 °C
1915	15.9 °C
1916	14.8 °C
1917	15.1 °C
1918	16.1 °C
1919	15.6 °C
1920	15.4 °C
1921	14.7 °C
1922	15.3 °C
1923	16.1 °C
1924	15.8 °C
1925	15.0 °C
1926	15.3 °C
1927	14.1 °C
1928	14.4 °C
1929	13.8 °C
1930	14.3 °C
1931	14.8 °C
1932	14.0 °C
1933	13.4 °C
1934	14.5 °C
1935	13.2 °C
1936	14.8 °C
1938	14.7 °C
1939	14.2 °C
1940	15.1 °C
1941	14.5 °C
1942	15.2 °C
1943	14.5 °C
1944	14.7 °C
1945	13.8 °C
1946	14.3 °C
1947	14.3 °C
1948	13.5 °C
1949	13.9 °C
1950	13.5 °C
1951	14.1 °C
1952	14.1 °C
1953	13.7 °C
1954	12.8 °C
1955	12.4 °C
1956	14.4 °C
1957	14.5 °C
1958	16.4 °C
1959	14.2 °C
1960	14.4 °C
1961	15.0 °C
1962	14.2 °C
1963	14.3 °C
1964	13.3 °C
1965	14.3 °C
1966	14.6 °C
1967	14.8 °C
1968	13.8 °C
1969	14.4 °C
1970	13.6 °C
1971	13.7 °C
1972	13.8 °C
1973	13.8 °C
1974	13.9 °C
1975	13.1 °C
1976	13.2 °C
1977	14.3 °C
1978	14.2 °C
1979	14.7 °C
1980	13.8 °C
1981	14.2 °C
1983	13.8 °C
1984	13.3 °C
1985	14.2 °C
1986	14.3 °C
1987	15.1 °C
1988	14.3 °C
1989	14.8 °C
1990	15.0 °C
1991	14.2 °C
1992	15.3 °C
1993	14.3 °C
1994	14.9 °C
1995	14.8 °C
1997	15.0 °C
1998	15.0 °C
1999	13.4 °C
2000	14.2 °C
2001	14.0 °C
2002	14.0 °C
2004	16.7 °C
2006	15.3 °C
2007	14.5 °C
2008	13.4 °C

What this means for you: Since 1899, Union Hill-Novelty Hill's last spring frost has come about 1 day earlier per decade, on average. The frost-free season has grown by about 2 days per decade. Year-to-year swings are large, so keep using the safe date rather than the trend.

Source: daily records from Snoqualmie Falls (NOAA GHCN-Daily). Years with too many missing days are left out.

Nearby towns

Sammamish Ames Lake Redmond Duvall Cottage Lake City of Sammamish