When to plant in Casselton, ND
Planting dates worked out from Casselton's own frost records, not a generic zone chart.
Safe to plant out
May 20
1 year in 10 has a later frost
Average last frost
May 10
about a 50% chance of a later one
Average first fall frost
Sep 29
1 year in 10 by Sep 16
Frost-free days
140
median, 1991–2020
Station used: Casselton Agronomy Farm · 3.1 km away · station 285 m, town 285 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 25 – Apr 8 | May 20 – Jun 3 | Jul 14 |
| Sweet pepper | Mar 11 – Mar 25 | May 20 – Jun 3 | Jul 19 |
| Lettuce (leaf) | Mar 14 – Mar 21 | Apr 18 – May 2 | May 28 |
| Peas | — | Apr 18 – May 16 | Jun 12 |
| Bush beans | — | May 13 – Jun 3 | Jul 2 |
| Carrot | — | Apr 25 – Jun 6 | Jun 24 |
| Beet | — | Apr 25 – Jun 6 | Jun 14 |
| Potato | — | Apr 25 – May 16 | Jul 4 |
| Kale | Mar 14 – Mar 28 | Apr 25 – May 9 | Jun 7 |
| Broccoli | Mar 7 – Mar 21 | Apr 18 – May 9 | Jun 17 |
| Cucumber | Apr 22 – Apr 29 | May 20 – Jun 3 | Jul 9 |
| Summer squash and zucchini | Apr 22 – Apr 29 | May 20 – Jun 3 | Jul 4 |
| Winter squash | Apr 22 – Apr 29 | May 20 – Jun 3 | Aug 8 |
| Sweet corn | — | May 13 – Jun 3 | Jul 12 |
| Onion (from sets) | — | Apr 18 – May 9 | Jul 17 |
| Garlic | — | Sep 15 – Oct 13 (fall) | following summer |
| Spinach | — | Apr 18 – May 16 | May 26 |
| Basil | Apr 8 – Apr 22 | May 20 – Jun 3 | Jul 16 |
Casselton'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 |
|---|---|
| 1985 | Apr 26 |
| 1987 | Apr 22 |
| 1988 | May 16 |
| 1989 | May 6 |
| 1990 | May 18 |
| 1991 | May 5 |
| 1992 | May 23 |
| 1993 | May 15 |
| 1994 | May 9 |
| 1995 | May 17 |
| 1997 | May 21 |
| 1999 | Apr 24 |
| 2000 | May 14 |
| 2001 | Apr 23 |
| 2002 | May 24 |
| 2003 | May 2 |
| 2004 | May 14 |
| 2005 | May 4 |
| 2006 | Apr 25 |
| 2007 | Apr 17 |
| 2008 | May 14 |
| 2009 | May 16 |
| 2010 | May 9 |
| 2011 | May 3 |
| 2014 | May 16 |
| 2015 | May 19 |
| 2016 | May 15 |
| 2017 | Apr 30 |
| 2018 | May 11 |
| 2019 | May 20 |
| 2020 | May 13 |
| 2021 | May 28 |
| 2022 | May 21 |
| 2023 | Apr 27 |
| 2024 | Apr 25 |
| 2025 | Apr 30 |
| 2026 | May 20 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1985 | 150 |
| 1988 | 140 |
| 1989 | 138 |
| 1990 | 127 |
| 1991 | 136 |
| 1992 | 121 |
| 1993 | 122 |
| 1994 | 167 |
| 1995 | 125 |
| 2000 | 132 |
| 2001 | 153 |
| 2002 | 122 |
| 2003 | 145 |
| 2004 | 140 |
| 2006 | 147 |
| 2007 | 150 |
| 2009 | 145 |
| 2010 | 158 |
| 2014 | 140 |
| 2015 | 140 |
| 2016 | 144 |
| 2017 | 162 |
| 2018 | 140 |
| 2019 | 143 |
| 2020 | 118 |
| 2021 | 141 |
| 2022 | 138 |
| 2023 | 162 |
| 2024 | 172 |
| 2025 | 160 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1985 | 15.3 °C |
| 1986 | 15.3 °C |
| 1988 | 18.1 °C |
| 1989 | 16.4 °C |
| 1990 | 16.0 °C |
| 1991 | 16.9 °C |
| 1992 | 13.9 °C |
| 1993 | 14.1 °C |
| 1994 | 15.7 °C |
| 1995 | 15.2 °C |
| 1996 | 14.6 °C |
| 1998 | 17.2 °C |
| 2000 | 15.6 °C |
| 2001 | 16.3 °C |
| 2002 | 15.7 °C |
| 2003 | 16.1 °C |
| 2004 | 14.6 °C |
| 2006 | 17.0 °C |
| 2007 | 16.2 °C |
| 2009 | 14.9 °C |
| 2010 | 16.6 °C |
| 2012 | 17.3 °C |
| 2014 | 15.3 °C |
| 2015 | 15.8 °C |
| 2016 | 16.3 °C |
| 2017 | 15.8 °C |
| 2018 | 15.4 °C |
| 2019 | 15.1 °C |
| 2020 | 15.7 °C |
| 2021 | 16.7 °C |
| 2022 | 15.5 °C |
| 2023 | 16.1 °C |
| 2024 | 16.6 °C |
| 2025 | 16.3 °C |
What this means for you: Since 1985, Casselton's last spring frost has come about 1 day later 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 Casselton Agronomy Farm (NOAA GHCN-Daily). Years with too many missing days are left out.