When to plant in Amboy, WA
Planting dates worked out from Amboy's own frost records, not a generic zone chart.
Safe to plant out
May 9
1 year in 10 has a later frost
Average last frost
Apr 20
about a 50% chance of a later one
Average first fall frost
Oct 17
1 year in 10 by Sep 26
Frost-free days
181
median, 1991–2020
Station used: Battle Ground · 16.7 km away · station 87 m, town 125 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 14 – Mar 28 | May 9 – May 23 | Jul 3 |
| Sweet pepper | Feb 28 – Mar 14 | May 9 – May 23 | Jul 8 |
| Lettuce (leaf) | Feb 16 – Feb 23 | Mar 23 – Apr 6 | May 2 |
| Peas | — | Mar 9 – Apr 6 | May 3 |
| Bush beans | — | May 2 – May 23 | Jun 21 |
| Carrot | — | Mar 30 – May 11 | May 29 |
| Beet | — | Mar 24 – May 5 | May 13 |
| Potato | — | Mar 30 – Apr 20 | Jun 8 |
| Kale | Feb 9 – Feb 23 | Mar 23 – Apr 6 | May 5 |
| Broccoli | Feb 9 – Feb 23 | Mar 23 – Apr 13 | May 22 |
| Cucumber | Apr 11 – Apr 18 | May 9 – May 23 | Jun 28 |
| Summer squash and zucchini | Apr 11 – Apr 18 | May 9 – May 23 | Jun 23 |
| Winter squash | Apr 11 – Apr 18 | May 9 – May 23 | Jul 28 |
| Sweet corn | — | May 2 – May 23 | Jul 1 |
| Onion (from sets) | — | Mar 23 – Apr 13 | Jun 21 |
| Garlic | — | Oct 3 – Oct 31 (fall) | following summer |
| Spinach | — | Mar 9 – Apr 6 | Apr 16 |
| Basil | Mar 28 – Apr 11 | May 9 – May 23 | Jul 5 |
Amboy'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 |
|---|---|
| 1941 | May 9 |
| 1942 | May 11 |
| 1943 | May 17 |
| 1944 | May 10 |
| 1945 | Apr 13 |
| 1946 | Apr 27 |
| 1947 | Apr 22 |
| 1948 | May 1 |
| 1949 | May 5 |
| 1950 | May 30 |
| 1951 | May 29 |
| 1952 | May 3 |
| 1953 | Apr 15 |
| 1956 | Apr 30 |
| 1957 | Apr 25 |
| 1958 | May 13 |
| 1959 | May 11 |
| 1960 | Apr 10 |
| 1961 | Apr 22 |
| 1962 | May 5 |
| 1963 | May 4 |
| 1964 | May 25 |
| 1965 | May 14 |
| 1966 | Jun 4 |
| 1967 | May 25 |
| 1968 | Apr 27 |
| 1969 | May 4 |
| 1970 | Apr 26 |
| 1971 | Apr 21 |
| 1972 | Apr 30 |
| 1973 | Apr 29 |
| 1974 | Apr 13 |
| 1976 | Apr 26 |
| 1977 | Apr 20 |
| 1978 | Apr 12 |
| 1979 | Apr 7 |
| 1980 | Apr 11 |
| 1981 | Apr 25 |
| 1982 | Apr 25 |
| 1983 | Apr 26 |
| 1984 | Apr 27 |
| 1985 | May 15 |
| 1986 | May 14 |
| 1987 | Apr 25 |
| 1988 | Apr 26 |
| 1989 | Apr 8 |
| 1990 | Apr 9 |
| 1991 | Apr 12 |
| 1992 | May 21 |
| 1993 | Apr 19 |
| 1994 | Mar 25 |
| 1995 | Apr 21 |
| 1996 | May 8 |
| 1997 | Apr 11 |
| 1998 | Apr 24 |
| 1999 | May 10 |
| 2000 | Apr 23 |
| 2001 | Apr 14 |
| 2002 | May 7 |
| 2003 | Apr 24 |
| 2004 | Apr 23 |
| 2005 | Mar 21 |
| 2008 | Apr 26 |
| 2009 | Apr 24 |
| 2010 | Apr 14 |
| 2011 | May 4 |
| 2012 | May 11 |
| 2013 | May 2 |
| 2014 | Apr 1 |
| 2015 | Apr 17 |
| 2016 | Mar 30 |
| 2017 | Apr 12 |
| 2018 | Apr 4 |
| 2019 | Apr 29 |
| 2020 | Apr 14 |
| 2021 | Apr 15 |
| 2022 | Apr 16 |
| 2023 | Apr 21 |
| 2024 | Apr 23 |
| 2025 | Apr 21 |
| 2026 | Apr 16 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1941 | 172 |
| 1943 | 147 |
| 1944 | 183 |
| 1945 | 166 |
| 1946 | 152 |
| 1947 | 185 |
| 1948 | 146 |
| 1949 | 138 |
| 1950 | 121 |
| 1951 | 148 |
| 1953 | 188 |
| 1956 | 144 |
| 1957 | 172 |
| 1958 | 163 |
| 1959 | 170 |
| 1960 | 181 |
| 1961 | 152 |
| 1962 | 163 |
| 1963 | 167 |
| 1964 | 144 |
| 1965 | 125 |
| 1966 | 126 |
| 1967 | 147 |
| 1968 | 157 |
| 1969 | 159 |
| 1970 | 139 |
| 1971 | 177 |
| 1973 | 154 |
| 1977 | 196 |
| 1978 | 191 |
| 1979 | 207 |
| 1980 | 180 |
| 1981 | 169 |
| 1982 | 175 |
| 1983 | 154 |
| 1984 | 177 |
| 1985 | 136 |
| 1986 | 150 |
| 1987 | 168 |
| 1988 | 182 |
| 1989 | 189 |
| 1990 | 180 |
| 1991 | 198 |
| 1992 | 146 |
| 1993 | 153 |
| 1994 | 190 |
| 1995 | 179 |
| 1996 | 159 |
| 1997 | 191 |
| 1998 | 176 |
| 1999 | 138 |
| 2000 | 151 |
| 2001 | 196 |
| 2002 | 156 |
| 2003 | 189 |
| 2004 | 193 |
| 2005 | 186 |
| 2008 | 167 |
| 2009 | 169 |
| 2010 | 183 |
| 2011 | 173 |
| 2012 | 147 |
| 2013 | 179 |
| 2014 | 224 |
| 2015 | 200 |
| 2016 | 232 |
| 2017 | 184 |
| 2018 | 217 |
| 2019 | 153 |
| 2020 | 190 |
| 2021 | 179 |
| 2022 | 204 |
| 2023 | 188 |
| 2024 | 182 |
| 2025 | 175 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1931 | 16.2 °C |
| 1941 | 15.1 °C |
| 1943 | 14.5 °C |
| 1944 | 14.3 °C |
| 1945 | 14.4 °C |
| 1946 | 14.5 °C |
| 1947 | 14.5 °C |
| 1948 | 13.4 °C |
| 1949 | 14.1 °C |
| 1950 | 14.4 °C |
| 1951 | 14.6 °C |
| 1953 | 14.7 °C |
| 1956 | 14.9 °C |
| 1957 | 15.0 °C |
| 1958 | 16.8 °C |
| 1959 | 14.6 °C |
| 1960 | 14.6 °C |
| 1961 | 15.2 °C |
| 1962 | 14.4 °C |
| 1963 | 14.5 °C |
| 1964 | 13.3 °C |
| 1965 | 14.3 °C |
| 1966 | 14.8 °C |
| 1967 | 15.5 °C |
| 1968 | 14.2 °C |
| 1969 | 15.0 °C |
| 1970 | 14.3 °C |
| 1971 | 14.4 °C |
| 1973 | 15.1 °C |
| 1974 | 14.8 °C |
| 1977 | 14.9 °C |
| 1978 | 14.8 °C |
| 1979 | 15.1 °C |
| 1980 | 14.4 °C |
| 1981 | 14.9 °C |
| 1982 | 14.5 °C |
| 1983 | 14.4 °C |
| 1984 | 13.9 °C |
| 1985 | 14.8 °C |
| 1986 | 14.8 °C |
| 1987 | 15.5 °C |
| 1988 | 14.7 °C |
| 1989 | 15.0 °C |
| 1990 | 15.7 °C |
| 1991 | 14.6 °C |
| 1992 | 16.1 °C |
| 1993 | 14.9 °C |
| 1994 | 15.6 °C |
| 1995 | 15.4 °C |
| 1996 | 14.8 °C |
| 1997 | 15.7 °C |
| 1998 | 15.7 °C |
| 1999 | 14.4 °C |
| 2000 | 15.2 °C |
| 2001 | 15.1 °C |
| 2002 | 14.8 °C |
| 2003 | 15.7 °C |
| 2004 | 16.1 °C |
| 2005 | 15.3 °C |
| 2007 | 14.9 °C |
| 2008 | 14.7 °C |
| 2009 | 15.7 °C |
| 2010 | 14.3 °C |
| 2011 | 14.0 °C |
| 2012 | 14.6 °C |
| 2013 | 15.5 °C |
| 2014 | 15.9 °C |
| 2015 | 15.9 °C |
| 2016 | 15.6 °C |
| 2017 | 15.8 °C |
| 2018 | 15.6 °C |
| 2019 | 15.3 °C |
| 2020 | 15.2 °C |
| 2021 | 15.7 °C |
| 2022 | 15.2 °C |
| 2023 | 15.6 °C |
| 2024 | 15.7 °C |
| 2025 | 16.4 °C |
What this means for you: Since 1941, Amboy's last spring frost has come about 3 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 Battle Ground (NOAA GHCN-Daily). Years with too many missing days are left out.