When to plant in Grandview, WA
Planting dates worked out from Grandview's own frost records, not a generic zone chart.
Safe to plant out
May 2
1 year in 10 has a later frost
Average last frost
Apr 7
about a 50% chance of a later one
Average first fall frost
Oct 16
1 year in 10 by Sep 28
Frost-free days
200
median, 1991–2020
Station used: Prosser · 12.3 km away · station 253 m, town 245 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 7 – Mar 21 | May 2 – May 16 | Jun 26 |
| Sweet pepper | Feb 21 – Mar 7 | May 2 – May 16 | Jul 1 |
| Lettuce (leaf) | Feb 3 – Feb 10 | Mar 10 – Mar 24 | Apr 19 |
| Peas | — | Mar 9 – Apr 6 | May 3 |
| Bush beans | — | Apr 25 – May 16 | Jun 14 |
| Carrot | — | Mar 20 – May 1 | May 19 |
| Beet | — | Mar 20 – May 1 | May 9 |
| Potato | — | Mar 20 – Apr 10 | May 29 |
| Kale | Feb 2 – Feb 16 | Mar 16 – Mar 30 | Apr 28 |
| Broccoli | Jan 27 – Feb 10 | Mar 10 – Mar 31 | May 9 |
| Cucumber | Apr 4 – Apr 11 | May 2 – May 16 | Jun 21 |
| Summer squash and zucchini | Apr 4 – Apr 11 | May 2 – May 16 | Jun 16 |
| Winter squash | Apr 4 – Apr 11 | May 2 – May 16 | Jul 21 |
| Sweet corn | — | Apr 25 – May 16 | Jun 24 |
| Onion (from sets) | — | Mar 10 – Mar 31 | Jun 8 |
| Garlic | — | Oct 2 – Oct 30 (fall) | following summer |
| Spinach | — | Mar 9 – Apr 6 | Apr 16 |
| Basil | Mar 21 – Apr 4 | May 2 – May 16 | Jun 28 |
Grandview'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 |
|---|---|
| 1926 | May 24 |
| 1927 | May 20 |
| 1929 | May 3 |
| 1931 | May 7 |
| 1932 | Apr 21 |
| 1933 | May 9 |
| 1934 | Jun 24 |
| 1935 | May 10 |
| 1936 | Apr 8 |
| 1937 | May 6 |
| 1938 | May 9 |
| 1939 | May 5 |
| 1940 | May 26 |
| 1941 | May 18 |
| 1942 | May 11 |
| 1943 | May 17 |
| 1944 | May 22 |
| 1945 | Apr 28 |
| 1946 | May 1 |
| 1947 | Apr 20 |
| 1948 | May 2 |
| 1949 | May 5 |
| 1950 | May 23 |
| 1951 | May 29 |
| 1952 | May 4 |
| 1953 | May 12 |
| 1954 | May 2 |
| 1955 | May 31 |
| 1956 | Apr 8 |
| 1957 | Apr 25 |
| 1958 | Apr 23 |
| 1959 | May 11 |
| 1960 | May 22 |
| 1961 | May 6 |
| 1962 | May 4 |
| 1963 | Apr 16 |
| 1964 | May 14 |
| 1965 | May 5 |
| 1966 | Apr 19 |
| 1967 | Apr 28 |
| 1968 | May 5 |
| 1969 | Apr 26 |
| 1970 | May 11 |
| 1971 | May 17 |
| 1972 | May 1 |
| 1973 | Apr 29 |
| 1974 | May 16 |
| 1975 | May 19 |
| 1976 | Apr 25 |
| 1977 | May 6 |
| 1978 | May 4 |
| 1979 | Apr 20 |
| 1980 | Apr 11 |
| 1981 | May 6 |
| 1982 | May 5 |
| 1983 | Apr 25 |
| 1985 | May 12 |
| 1987 | Apr 20 |
| 1988 | Apr 30 |
| 1990 | Mar 29 |
| 1991 | May 9 |
| 1997 | Apr 12 |
| 1999 | May 9 |
| 2000 | Apr 29 |
| 2001 | Apr 16 |
| 2002 | Apr 4 |
| 2003 | Apr 4 |
| 2004 | Feb 26 |
| 2005 | Apr 15 |
| 2006 | Mar 16 |
| 2007 | Apr 4 |
| 2008 | Apr 22 |
| 2015 | Mar 7 |
| 2016 | Mar 28 |
| 2017 | Apr 12 |
| 2018 | Apr 5 |
| 2019 | Mar 21 |
| 2020 | Apr 5 |
| 2023 | Apr 21 |
| 2026 | Mar 31 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1926 | 121 |
| 1931 | 149 |
| 1932 | 152 |
| 1933 | 138 |
| 1934 | 113 |
| 1935 | 158 |
| 1936 | 159 |
| 1937 | 139 |
| 1938 | 160 |
| 1939 | 155 |
| 1940 | 153 |
| 1941 | 142 |
| 1942 | 154 |
| 1943 | 147 |
| 1944 | 163 |
| 1945 | 151 |
| 1946 | 149 |
| 1947 | 195 |
| 1948 | 149 |
| 1949 | 157 |
| 1950 | 130 |
| 1951 | 138 |
| 1952 | 163 |
| 1953 | 164 |
| 1954 | 151 |
| 1955 | 127 |
| 1956 | 196 |
| 1957 | 192 |
| 1958 | 179 |
| 1959 | 148 |
| 1960 | 139 |
| 1961 | 164 |
| 1962 | 186 |
| 1963 | 185 |
| 1964 | 141 |
| 1965 | 134 |
| 1966 | 176 |
| 1967 | 174 |
| 1968 | 149 |
| 1969 | 169 |
| 1970 | 126 |
| 1971 | 123 |
| 1972 | 146 |
| 1973 | 155 |
| 1974 | 133 |
| 1975 | 155 |
| 1976 | 172 |
| 1977 | 150 |
| 1978 | 161 |
| 1979 | 194 |
| 1980 | 188 |
| 1981 | 149 |
| 1982 | 165 |
| 1983 | 147 |
| 1985 | 139 |
| 1987 | 177 |
| 1988 | 179 |
| 1991 | 160 |
| 1997 | 183 |
| 1999 | 141 |
| 2000 | 146 |
| 2001 | 165 |
| 2002 | 203 |
| 2003 | 209 |
| 2004 | 241 |
| 2005 | 195 |
| 2006 | 228 |
| 2007 | 205 |
| 2016 | 233 |
| 2018 | 216 |
| 2019 | 194 |
| 2020 | 200 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1927 | 16.8 °C |
| 1931 | 18.5 °C |
| 1933 | 16.8 °C |
| 1937 | 17.0 °C |
| 1938 | 18.0 °C |
| 1939 | 17.9 °C |
| 1940 | 17.8 °C |
| 1941 | 17.2 °C |
| 1942 | 17.4 °C |
| 1943 | 16.6 °C |
| 1944 | 17.1 °C |
| 1945 | 16.8 °C |
| 1946 | 17.1 °C |
| 1947 | 17.7 °C |
| 1948 | 16.3 °C |
| 1949 | 17.2 °C |
| 1950 | 16.6 °C |
| 1951 | 17.5 °C |
| 1952 | 17.5 °C |
| 1953 | 15.8 °C |
| 1954 | 15.9 °C |
| 1955 | 15.6 °C |
| 1956 | 17.7 °C |
| 1957 | 17.2 °C |
| 1958 | 18.4 °C |
| 1959 | 16.2 °C |
| 1960 | 16.8 °C |
| 1961 | 17.6 °C |
| 1962 | 16.8 °C |
| 1963 | 17.1 °C |
| 1964 | 16.2 °C |
| 1965 | 17.1 °C |
| 1966 | 17.5 °C |
| 1967 | 18.3 °C |
| 1968 | 16.9 °C |
| 1969 | 17.2 °C |
| 1970 | 16.4 °C |
| 1971 | 16.2 °C |
| 1972 | 16.7 °C |
| 1973 | 16.9 °C |
| 1974 | 16.7 °C |
| 1975 | 16.0 °C |
| 1976 | 16.3 °C |
| 1977 | 17.5 °C |
| 1978 | 16.6 °C |
| 1979 | 17.6 °C |
| 1980 | 16.4 °C |
| 1981 | 16.7 °C |
| 1982 | 16.6 °C |
| 1983 | 16.5 °C |
| 1985 | 17.6 °C |
| 1987 | 18.6 °C |
| 1988 | 17.4 °C |
| 1990 | 18.5 °C |
| 1991 | 17.5 °C |
| 1992 | 18.1 °C |
| 1993 | 16.7 °C |
| 1997 | 18.8 °C |
| 1999 | 18.1 °C |
| 2000 | 18.5 °C |
| 2001 | 18.3 °C |
| 2002 | 19.1 °C |
| 2003 | 19.7 °C |
| 2004 | 19.8 °C |
| 2005 | 19.2 °C |
| 2006 | 19.5 °C |
| 2007 | 19.0 °C |
| 2011 | 17.0 °C |
| 2016 | 19.7 °C |
| 2018 | 19.4 °C |
| 2019 | 19.1 °C |
| 2020 | 19.1 °C |
| 2022 | 18.6 °C |
What this means for you: Since 1926, Grandview's last spring frost has come about 5 days earlier per decade, on average. The frost-free season has grown by about 7 days per decade. Year-to-year swings are large, so keep using the safe date rather than the trend.
Source: daily records from Prosser (NOAA GHCN-Daily). Years with too many missing days are left out.