When to plant in Saint-Hyacinthe, QC
Planting dates worked out from Saint-Hyacinthe's own frost records, not a generic zone chart.
Safe to plant out
May 26
1 year in 10 has a later frost
Average last frost
May 7
about a 50% chance of a later one
Average first fall frost
Oct 6
1 year in 10 by Sep 22
Frost-free days
154
median, 1991–2020
Station used: St Hyacinthe 2 · 7.8 km away · station 33 m, town 32 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 31 – Apr 14 | May 26 – Jun 9 | Jul 20 |
| Sweet pepper | Mar 17 – Mar 31 | May 26 – Jun 9 | Jul 25 |
| Lettuce (leaf) | Mar 13 – Mar 20 | Apr 17 – May 1 | May 27 |
| Peas | — | Apr 17 – May 15 | Jun 11 |
| Bush beans | — | May 19 – Jun 9 | Jul 8 |
| Carrot | — | Apr 23 – Jun 4 | Jun 22 |
| Beet | — | Apr 23 – Jun 4 | Jun 12 |
| Potato | — | Apr 23 – May 14 | Jul 2 |
| Kale | Mar 13 – Mar 27 | Apr 24 – May 8 | Jun 6 |
| Broccoli | Mar 6 – Mar 20 | Apr 17 – May 8 | Jun 16 |
| Cucumber | Apr 28 – May 5 | May 26 – Jun 9 | Jul 15 |
| Summer squash and zucchini | Apr 28 – May 5 | May 26 – Jun 9 | Jul 10 |
| Winter squash | Apr 28 – May 5 | May 26 – Jun 9 | Aug 14 |
| Sweet corn | — | May 19 – Jun 9 | Jul 18 |
| Onion (from sets) | — | Apr 17 – May 8 | Jul 16 |
| Garlic | — | Sep 22 – Oct 20 (fall) | following summer |
| Spinach | — | Apr 17 – May 15 | May 25 |
| Basil | Apr 14 – Apr 28 | May 26 – Jun 9 | Jul 22 |
Saint-Hyacinthe'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 |
|---|---|
| 1969 | May 27 |
| 1970 | May 7 |
| 1971 | May 24 |
| 1973 | Apr 20 |
| 1974 | May 19 |
| 1975 | Apr 28 |
| 1976 | Apr 25 |
| 1977 | May 9 |
| 1978 | May 4 |
| 1979 | May 7 |
| 1980 | May 5 |
| 1981 | May 18 |
| 1982 | Apr 30 |
| 1983 | May 17 |
| 1984 | Apr 13 |
| 1985 | May 9 |
| 1986 | Jun 3 |
| 1987 | May 16 |
| 1988 | Apr 26 |
| 1989 | Apr 29 |
| 1990 | Apr 22 |
| 1991 | Apr 14 |
| 1992 | May 6 |
| 1993 | Apr 28 |
| 1994 | May 3 |
| 1995 | May 9 |
| 1996 | Apr 17 |
| 1997 | May 27 |
| 1999 | Apr 29 |
| 2000 | May 3 |
| 2001 | May 6 |
| 2002 | May 25 |
| 2003 | May 3 |
| 2004 | May 8 |
| 2005 | May 13 |
| 2006 | May 7 |
| 2007 | May 6 |
| 2008 | May 30 |
| 2009 | May 26 |
| 2010 | May 13 |
| 2012 | Apr 30 |
| 2013 | Apr 26 |
| 2015 | Apr 19 |
| 2017 | May 9 |
| 2018 | May 12 |
| 2020 | May 13 |
| 2021 | Apr 27 |
| 2022 | May 1 |
| 2023 | May 18 |
| 2024 | Apr 26 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1969 | 114 |
| 1970 | 162 |
| 1971 | 141 |
| 1973 | 153 |
| 1974 | 127 |
| 1975 | 157 |
| 1976 | 168 |
| 1977 | 151 |
| 1978 | 136 |
| 1979 | 135 |
| 1980 | 146 |
| 1981 | 135 |
| 1982 | 162 |
| 1983 | 145 |
| 1984 | 174 |
| 1985 | 154 |
| 1986 | 128 |
| 1987 | 133 |
| 1988 | 155 |
| 1989 | 150 |
| 1990 | 180 |
| 1991 | 168 |
| 1993 | 144 |
| 1994 | 161 |
| 1995 | 137 |
| 1996 | 169 |
| 1999 | 158 |
| 2000 | 147 |
| 2001 | 146 |
| 2002 | 133 |
| 2003 | 168 |
| 2004 | 149 |
| 2005 | 160 |
| 2006 | 151 |
| 2007 | 159 |
| 2008 | 111 |
| 2009 | 122 |
| 2012 | 165 |
| 2017 | 160 |
| 2018 | 158 |
| 2020 | 130 |
| 2021 | 180 |
| 2022 | 154 |
| 2023 | 164 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1969 | 14.8 °C |
| 1970 | 15.5 °C |
| 1971 | 15.1 °C |
| 1973 | 16.0 °C |
| 1974 | 14.6 °C |
| 1975 | 16.1 °C |
| 1976 | 15.4 °C |
| 1977 | 15.5 °C |
| 1978 | 15.3 °C |
| 1979 | 15.8 °C |
| 1980 | 15.4 °C |
| 1981 | 15.6 °C |
| 1982 | 15.1 °C |
| 1983 | 16.1 °C |
| 1984 | 16.1 °C |
| 1985 | 15.3 °C |
| 1986 | 15.1 °C |
| 1987 | 16.1 °C |
| 1988 | 16.2 °C |
| 1989 | 16.0 °C |
| 1990 | 15.5 °C |
| 1991 | 16.2 °C |
| 1993 | 15.4 °C |
| 1994 | 15.4 °C |
| 1995 | 15.6 °C |
| 1996 | 15.4 °C |
| 1999 | 16.8 °C |
| 2000 | 14.5 °C |
| 2001 | 16.1 °C |
| 2002 | 15.9 °C |
| 2003 | 15.7 °C |
| 2004 | 15.2 °C |
| 2005 | 16.3 °C |
| 2006 | 15.6 °C |
| 2007 | 15.1 °C |
| 2008 | 15.3 °C |
| 2009 | 14.3 °C |
| 2010 | 16.8 °C |
| 2012 | 16.9 °C |
| 2015 | 16.8 °C |
| 2017 | 15.7 °C |
| 2018 | 16.3 °C |
| 2020 | 15.8 °C |
| 2021 | 17.2 °C |
| 2022 | 16.4 °C |
| 2023 | 16.5 °C |
What this means for you: Since 1969, Saint-Hyacinthe's last spring frost has stayed at about the same time of year. 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 St Hyacinthe 2 (NOAA GHCN-Daily, from Environment and Climate Change Canada). Years with too many missing days are left out.