When to plant in Knob Noster, MO
Planting dates worked out from Knob Noster's own frost records, not a generic zone chart.
Safe to plant out
Apr 22
1 year in 10 has a later frost
Average last frost
Apr 12
about a 50% chance of a later one
Average first fall frost
Oct 19
1 year in 10 by Oct 7
Frost-free days
190
median, 1991–2020
Station used: Sweet Springs · 25.3 km away · station 206 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 | Feb 25 – Mar 11 | Apr 22 – May 6 | Jun 16 |
| Sweet pepper | Feb 11 – Feb 25 | Apr 22 – May 6 | Jun 21 |
| Lettuce (leaf) | Feb 8 – Feb 15 | Mar 15 – Mar 29 | Apr 24 |
| Peas | — | Mar 12 – Apr 9 | May 6 |
| Bush beans | — | Apr 15 – May 6 | Jun 4 |
| Carrot | — | Mar 22 – May 3 | May 21 |
| Beet | — | Mar 21 – May 2 | May 10 |
| Potato | — | Mar 22 – Apr 12 | May 31 |
| Kale | Feb 5 – Feb 19 | Mar 19 – Apr 2 | May 1 |
| Broccoli | Feb 1 – Feb 15 | Mar 15 – Apr 5 | May 14 |
| Cucumber | Mar 25 – Apr 1 | Apr 22 – May 6 | Jun 11 |
| Summer squash and zucchini | Mar 25 – Apr 1 | Apr 22 – May 6 | Jun 6 |
| Winter squash | Mar 25 – Apr 1 | Apr 22 – May 6 | Jul 11 |
| Sweet corn | — | Apr 15 – May 6 | Jun 14 |
| Onion (from sets) | — | Mar 15 – Apr 5 | Jun 13 |
| Garlic | — | Oct 5 – Nov 2 (fall) | following summer |
| Spinach | — | Mar 12 – Apr 9 | Apr 19 |
| Basil | Mar 11 – Mar 25 | Apr 22 – May 6 | Jun 18 |
Knob Noster'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 | Mar 29 |
| 1942 | Apr 12 |
| 1943 | Apr 21 |
| 1944 | May 6 |
| 1945 | Apr 5 |
| 1946 | Apr 12 |
| 1947 | Apr 7 |
| 1948 | Apr 14 |
| 1949 | Apr 19 |
| 1950 | Apr 26 |
| 1951 | Apr 23 |
| 1952 | Apr 16 |
| 1953 | Apr 27 |
| 1954 | May 4 |
| 1955 | Apr 8 |
| 1956 | Apr 24 |
| 1957 | Apr 14 |
| 1958 | Apr 30 |
| 1959 | Apr 22 |
| 1960 | May 1 |
| 1961 | May 2 |
| 1962 | Apr 16 |
| 1963 | May 23 |
| 1964 | Apr 9 |
| 1965 | Apr 16 |
| 1966 | Apr 21 |
| 1967 | Apr 27 |
| 1968 | Apr 25 |
| 1969 | Mar 31 |
| 1970 | Apr 9 |
| 1971 | May 3 |
| 1972 | Apr 25 |
| 1973 | Apr 13 |
| 1974 | Apr 24 |
| 1975 | Apr 20 |
| 1976 | May 3 |
| 1977 | Apr 6 |
| 1978 | Mar 27 |
| 1979 | Apr 6 |
| 1980 | May 9 |
| 1981 | Apr 6 |
| 1982 | Apr 23 |
| 1983 | Apr 19 |
| 1984 | Apr 1 |
| 1985 | Apr 9 |
| 1986 | Apr 22 |
| 1987 | Apr 12 |
| 1988 | Apr 24 |
| 1989 | May 2 |
| 1990 | Apr 12 |
| 1991 | Mar 30 |
| 1992 | Apr 3 |
| 1993 | Apr 22 |
| 1994 | Apr 7 |
| 1995 | Apr 13 |
| 1996 | Apr 10 |
| 1997 | May 1 |
| 1998 | Apr 5 |
| 1999 | Apr 18 |
| 2000 | Apr 12 |
| 2001 | Apr 18 |
| 2003 | Apr 11 |
| 2004 | Apr 13 |
| 2005 | May 3 |
| 2006 | Apr 9 |
| 2007 | Apr 15 |
| 2008 | Apr 14 |
| 2009 | Apr 11 |
| 2010 | Mar 29 |
| 2017 | Mar 16 |
| 2018 | Apr 20 |
| 2020 | Apr 18 |
| 2021 | May 13 |
| 2022 | Apr 26 |
| 2026 | Mar 29 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1941 | 212 |
| 1942 | 164 |
| 1943 | 176 |
| 1944 | 155 |
| 1945 | 186 |
| 1946 | 182 |
| 1947 | 214 |
| 1948 | 186 |
| 1949 | 188 |
| 1950 | 161 |
| 1951 | 190 |
| 1952 | 172 |
| 1953 | 179 |
| 1954 | 178 |
| 1955 | 189 |
| 1956 | 184 |
| 1957 | 186 |
| 1958 | 153 |
| 1959 | 169 |
| 1960 | 171 |
| 1961 | 165 |
| 1962 | 190 |
| 1963 | 158 |
| 1964 | 178 |
| 1965 | 178 |
| 1966 | 167 |
| 1967 | 154 |
| 1968 | 161 |
| 1969 | 199 |
| 1970 | 189 |
| 1971 | 180 |
| 1972 | 176 |
| 1973 | 199 |
| 1974 | 166 |
| 1975 | 164 |
| 1976 | 155 |
| 1977 | 189 |
| 1978 | 193 |
| 1979 | 181 |
| 1980 | 155 |
| 1981 | 184 |
| 1983 | 156 |
| 1984 | 181 |
| 1985 | 174 |
| 1986 | 200 |
| 1987 | 173 |
| 1988 | 163 |
| 1989 | 144 |
| 1990 | 189 |
| 1991 | 190 |
| 1992 | 196 |
| 1993 | 170 |
| 1994 | 200 |
| 1995 | 161 |
| 1996 | 191 |
| 1997 | 173 |
| 1998 | 214 |
| 1999 | 182 |
| 2000 | 177 |
| 2001 | 181 |
| 2003 | 197 |
| 2004 | 205 |
| 2005 | 174 |
| 2006 | 186 |
| 2007 | 195 |
| 2008 | 196 |
| 2009 | 189 |
| 2017 | 225 |
| 2021 | 172 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1941 | 22.3 °C |
| 1942 | 21.1 °C |
| 1943 | 20.9 °C |
| 1944 | 20.5 °C |
| 1945 | 20.0 °C |
| 1946 | 20.9 °C |
| 1947 | 20.9 °C |
| 1948 | 21.2 °C |
| 1949 | 20.4 °C |
| 1950 | 19.2 °C |
| 1951 | 19.8 °C |
| 1952 | 21.6 °C |
| 1953 | 21.9 °C |
| 1954 | 22.7 °C |
| 1955 | 21.7 °C |
| 1956 | 21.7 °C |
| 1957 | 20.9 °C |
| 1958 | 20.5 °C |
| 1959 | 21.4 °C |
| 1960 | 20.9 °C |
| 1961 | 19.3 °C |
| 1962 | 21.0 °C |
| 1963 | 21.5 °C |
| 1964 | 21.4 °C |
| 1965 | 21.2 °C |
| 1966 | 19.6 °C |
| 1967 | 19.6 °C |
| 1968 | 20.1 °C |
| 1969 | 20.7 °C |
| 1970 | 21.3 °C |
| 1971 | 21.1 °C |
| 1972 | 21.5 °C |
| 1973 | 20.8 °C |
| 1974 | 20.4 °C |
| 1975 | 21.2 °C |
| 1976 | 20.8 °C |
| 1977 | 22.3 °C |
| 1978 | 21.5 °C |
| 1979 | 20.4 °C |
| 1980 | 22.5 °C |
| 1981 | 21.4 °C |
| 1982 | 20.4 °C |
| 1983 | 21.1 °C |
| 1984 | 20.8 °C |
| 1985 | 21.2 °C |
| 1986 | 22.1 °C |
| 1987 | 22.3 °C |
| 1988 | 22.1 °C |
| 1989 | 20.2 °C |
| 1990 | 21.1 °C |
| 1991 | 22.3 °C |
| 1992 | 19.8 °C |
| 1993 | 20.4 °C |
| 1994 | 20.8 °C |
| 1995 | 20.6 °C |
| 1996 | 20.4 °C |
| 1997 | 19.4 °C |
| 1998 | 21.4 °C |
| 1999 | 20.4 °C |
| 2000 | 20.8 °C |
| 2001 | 21.2 °C |
| 2003 | 20.8 °C |
| 2004 | 19.9 °C |
| 2005 | 21.6 °C |
| 2006 | 21.6 °C |
| 2007 | 21.4 °C |
| 2008 | 19.9 °C |
| 2009 | 19.7 °C |
| 2010 | 21.8 °C |
| 2017 | 20.6 °C |
| 2018 | 20.9 °C |
| 2020 | 19.9 °C |
| 2021 | 20.9 °C |
| 2022 | 20.8 °C |
What this means for you: Since 1941, Knob Noster'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 Sweet Springs (NOAA GHCN-Daily). Years with too many missing days are left out.