When to plant in West Clarkston-Highland, WA
Planting dates worked out from West Clarkston-Highland's own frost records, not a generic zone chart.
Safe to plant out
Apr 24
1 year in 10 has a later frost
Average last frost
Apr 9
about a 50% chance of a later one
Average first fall frost
Oct 24
1 year in 10 by Oct 11
Frost-free days
196
median, 1991–2020
Station used: Lewiston Ap · 4.9 km away · station 436 m, town 285 m. How we match towns to stations
The station sits 151 m higher 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 1 – Mar 15 | Apr 26 – May 10 | Jun 20 |
| Sweet pepper | Feb 15 – Mar 1 | Apr 26 – May 10 | Jun 25 |
| Lettuce (leaf) | Feb 5 – Feb 12 | Mar 12 – Mar 26 | Apr 21 |
| Peas | — | Mar 7 – Apr 4 | May 1 |
| Bush beans | — | Apr 18 – May 9 | Jun 7 |
| Carrot | — | Mar 22 – May 3 | May 21 |
| Beet | — | Mar 22 – May 3 | May 11 |
| Potato | — | Mar 22 – Apr 12 | May 31 |
| Kale | Jan 31 – Feb 14 | Mar 14 – Mar 28 | Apr 26 |
| Broccoli | Jan 29 – Feb 12 | Mar 12 – Apr 2 | May 11 |
| Cucumber | Mar 29 – Apr 5 | Apr 26 – May 10 | Jun 15 |
| Summer squash and zucchini | Mar 29 – Apr 5 | Apr 26 – May 10 | Jun 10 |
| Winter squash | Mar 29 – Apr 5 | Apr 26 – May 10 | Jul 15 |
| Sweet corn | — | Apr 18 – May 9 | Jun 17 |
| Onion (from sets) | — | Mar 12 – Apr 2 | Jun 10 |
| Garlic | — | Oct 8 – Nov 5 (fall) | following summer |
| Spinach | — | Mar 7 – Apr 4 | Apr 14 |
| Basil | Mar 15 – Mar 29 | Apr 26 – May 10 | Jun 22 |
West Clarkston-Highland'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 |
|---|---|
| 1948 | May 2 |
| 1949 | Apr 3 |
| 1950 | Apr 29 |
| 1951 | May 30 |
| 1952 | Apr 10 |
| 1953 | Apr 10 |
| 1954 | May 2 |
| 1955 | May 14 |
| 1956 | Apr 30 |
| 1957 | Apr 16 |
| 1958 | Mar 27 |
| 1959 | Apr 14 |
| 1960 | May 22 |
| 1961 | Apr 20 |
| 1962 | Mar 30 |
| 1963 | Apr 19 |
| 1964 | Apr 19 |
| 1965 | Apr 7 |
| 1966 | Apr 19 |
| 1967 | May 1 |
| 1968 | Apr 22 |
| 1969 | May 3 |
| 1970 | Apr 17 |
| 1971 | Apr 19 |
| 1972 | May 1 |
| 1973 | Apr 29 |
| 1974 | Apr 13 |
| 1975 | Apr 2 |
| 1976 | Apr 16 |
| 1977 | Apr 19 |
| 1978 | Apr 13 |
| 1979 | Apr 3 |
| 1980 | Apr 2 |
| 1981 | Apr 13 |
| 1982 | May 5 |
| 1983 | Apr 14 |
| 1984 | Apr 29 |
| 1985 | May 12 |
| 1986 | Apr 30 |
| 1987 | Apr 20 |
| 1988 | Apr 9 |
| 1989 | Mar 4 |
| 1990 | Mar 25 |
| 1991 | Mar 27 |
| 1992 | Apr 8 |
| 1993 | Apr 6 |
| 1994 | Mar 26 |
| 1995 | Apr 16 |
| 1996 | Apr 3 |
| 1997 | Apr 12 |
| 1998 | Mar 30 |
| 1999 | Apr 15 |
| 2000 | Mar 31 |
| 2001 | Apr 14 |
| 2002 | Apr 24 |
| 2003 | Apr 19 |
| 2004 | Apr 1 |
| 2005 | Mar 14 |
| 2006 | Mar 27 |
| 2007 | Apr 11 |
| 2008 | Apr 21 |
| 2009 | Apr 24 |
| 2010 | Apr 10 |
| 2011 | Apr 29 |
| 2012 | Apr 7 |
| 2013 | May 1 |
| 2014 | Mar 24 |
| 2015 | Apr 5 |
| 2016 | Mar 29 |
| 2017 | Apr 11 |
| 2018 | Apr 2 |
| 2019 | Apr 29 |
| 2020 | Apr 17 |
| 2021 | Apr 12 |
| 2022 | Apr 17 |
| 2023 | Apr 20 |
| 2024 | Mar 25 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1948 | 166 |
| 1949 | 187 |
| 1950 | 152 |
| 1951 | 139 |
| 1952 | 205 |
| 1953 | 194 |
| 1954 | 150 |
| 1955 | 165 |
| 1956 | 174 |
| 1957 | 155 |
| 1958 | 210 |
| 1959 | 169 |
| 1960 | 139 |
| 1961 | 171 |
| 1962 | 229 |
| 1963 | 189 |
| 1964 | 208 |
| 1965 | 162 |
| 1966 | 177 |
| 1967 | 184 |
| 1968 | 168 |
| 1969 | 162 |
| 1970 | 149 |
| 1971 | 178 |
| 1972 | 175 |
| 1973 | 156 |
| 1974 | 175 |
| 1975 | 204 |
| 1976 | 185 |
| 1977 | 197 |
| 1978 | 191 |
| 1979 | 220 |
| 1980 | 203 |
| 1981 | 190 |
| 1982 | 165 |
| 1983 | 206 |
| 1984 | 168 |
| 1985 | 139 |
| 1986 | 185 |
| 1987 | 181 |
| 1988 | 200 |
| 1989 | 238 |
| 1990 | 255 |
| 1991 | 204 |
| 1992 | 189 |
| 1993 | 202 |
| 1994 | 217 |
| 1995 | 195 |
| 1996 | 196 |
| 1997 | 195 |
| 1998 | 202 |
| 1999 | 183 |
| 2000 | 175 |
| 2001 | 205 |
| 2002 | 170 |
| 2003 | 188 |
| 2004 | 213 |
| 2005 | 238 |
| 2006 | 215 |
| 2007 | 197 |
| 2008 | 172 |
| 2009 | 167 |
| 2010 | 212 |
| 2011 | 178 |
| 2012 | 196 |
| 2013 | 166 |
| 2014 | 230 |
| 2015 | 220 |
| 2016 | 231 |
| 2017 | 202 |
| 2018 | 194 |
| 2019 | 155 |
| 2020 | 187 |
| 2021 | 182 |
| 2022 | 203 |
| 2023 | 189 |
| 2024 | 225 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1948 | 16.7 °C |
| 1949 | 18.6 °C |
| 1950 | 17.2 °C |
| 1951 | 17.6 °C |
| 1952 | 18.1 °C |
| 1953 | 17.0 °C |
| 1954 | 16.4 °C |
| 1955 | 16.4 °C |
| 1956 | 17.7 °C |
| 1957 | 17.8 °C |
| 1958 | 19.0 °C |
| 1959 | 16.7 °C |
| 1960 | 17.5 °C |
| 1961 | 18.6 °C |
| 1962 | 17.3 °C |
| 1963 | 18.2 °C |
| 1964 | 16.6 °C |
| 1965 | 17.4 °C |
| 1966 | 18.4 °C |
| 1967 | 19.1 °C |
| 1968 | 17.7 °C |
| 1969 | 18.4 °C |
| 1970 | 17.9 °C |
| 1971 | 17.8 °C |
| 1972 | 17.8 °C |
| 1973 | 18.9 °C |
| 1974 | 18.6 °C |
| 1975 | 17.6 °C |
| 1976 | 18.0 °C |
| 1977 | 19.0 °C |
| 1978 | 17.4 °C |
| 1979 | 18.9 °C |
| 1980 | 17.8 °C |
| 1981 | 17.9 °C |
| 1982 | 17.9 °C |
| 1983 | 17.6 °C |
| 1984 | 17.5 °C |
| 1985 | 18.1 °C |
| 1986 | 18.1 °C |
| 1987 | 19.4 °C |
| 1988 | 18.4 °C |
| 1989 | 18.9 °C |
| 1990 | 20.1 °C |
| 1991 | 17.5 °C |
| 1992 | 18.9 °C |
| 1993 | 17.2 °C |
| 1994 | 19.5 °C |
| 1995 | 17.6 °C |
| 1996 | 17.4 °C |
| 1997 | 18.3 °C |
| 1998 | 19.3 °C |
| 1999 | 17.4 °C |
| 2000 | 18.1 °C |
| 2001 | 18.4 °C |
| 2002 | 17.9 °C |
| 2003 | 19.0 °C |
| 2004 | 19.0 °C |
| 2005 | 18.6 °C |
| 2006 | 19.3 °C |
| 2007 | 19.1 °C |
| 2008 | 18.2 °C |
| 2009 | 19.0 °C |
| 2010 | 17.6 °C |
| 2011 | 17.4 °C |
| 2012 | 19.2 °C |
| 2013 | 19.5 °C |
| 2014 | 19.7 °C |
| 2015 | 20.1 °C |
| 2016 | 19.4 °C |
| 2017 | 19.4 °C |
| 2018 | 19.4 °C |
| 2019 | 19.4 °C |
| 2020 | 19.0 °C |
| 2021 | 20.7 °C |
| 2022 | 19.1 °C |
| 2023 | 20.4 °C |
| 2024 | 20.1 °C |
What this means for you: Since 1948, West Clarkston-Highland's last spring frost has come about 2 days earlier per decade, on average. The frost-free season has grown by about 4 days per decade. Year-to-year swings are large, so keep using the safe date rather than the trend.
Source: daily records from Lewiston Ap (NOAA GHCN-Daily). Years with too many missing days are left out.