When to plant in Magna, UT
Planting dates worked out from Magna's own frost records, not a generic zone chart.
Safe to plant out
Apr 20
1 year in 10 has a later frost
Average last frost
Apr 7
about a 50% chance of a later one
Average first fall frost
Nov 3
1 year in 10 by Oct 21
Frost-free days
209
median, 1991–2020
Station used: Garfield · 8.3 km away · station 1310 m, town 1304 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 3 – Feb 10 | Mar 10 – Mar 24 | Apr 19 |
| Peas | — | Mar 7 – Apr 4 | May 1 |
| Bush beans | — | Apr 15 – May 6 | Jun 4 |
| Carrot | — | Mar 19 – Apr 30 | May 18 |
| Beet | — | Mar 19 – Apr 30 | May 8 |
| Potato | — | Mar 19 – Apr 9 | May 28 |
| Kale | Jan 31 – Feb 14 | Mar 14 – Mar 28 | Apr 26 |
| Broccoli | Jan 27 – Feb 10 | Mar 10 – Mar 31 | May 9 |
| 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 10 – Mar 31 | Jun 8 |
| Garlic | — | Oct 13 – Nov 10 (fall) | following summer |
| Spinach | — | Mar 7 – Apr 4 | Apr 14 |
| Basil | Mar 11 – Mar 25 | Apr 22 – May 6 | Jun 18 |
Magna'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 |
|---|---|
| 1925 | Apr 6 |
| 1926 | Apr 2 |
| 1927 | Apr 21 |
| 1928 | Apr 21 |
| 1951 | Mar 29 |
| 1952 | Mar 27 |
| 1953 | Apr 30 |
| 1954 | May 2 |
| 1955 | Apr 27 |
| 1956 | Apr 6 |
| 1957 | Mar 24 |
| 1958 | Apr 25 |
| 1959 | Apr 20 |
| 1960 | Apr 25 |
| 1961 | May 13 |
| 1962 | Mar 29 |
| 1963 | Apr 22 |
| 1964 | Apr 25 |
| 1965 | May 7 |
| 1966 | Apr 20 |
| 1968 | Apr 22 |
| 1969 | Mar 26 |
| 1970 | Apr 29 |
| 1971 | May 18 |
| 1978 | May 6 |
| 1979 | Apr 12 |
| 1980 | Apr 8 |
| 1981 | May 13 |
| 1982 | Apr 20 |
| 1983 | Apr 7 |
| 1984 | Apr 28 |
| 1988 | May 1 |
| 1989 | Mar 7 |
| 1990 | Apr 28 |
| 1992 | Mar 17 |
| 1994 | Mar 24 |
| 1995 | Apr 14 |
| 1996 | Apr 20 |
| 1997 | Apr 24 |
| 1998 | Apr 15 |
| 1999 | Apr 10 |
| 2000 | Mar 30 |
| 2001 | Apr 8 |
| 2002 | Mar 19 |
| 2003 | Apr 7 |
| 2004 | Mar 9 |
| 2006 | Apr 18 |
| 2007 | Mar 29 |
| 2008 | Apr 21 |
| 2009 | Apr 9 |
| 2010 | Apr 10 |
| 2011 | Apr 10 |
| 2012 | Apr 6 |
| 2013 | Apr 18 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1925 | 211 |
| 1926 | 175 |
| 1927 | 168 |
| 1928 | 207 |
| 1951 | 206 |
| 1952 | 220 |
| 1953 | 177 |
| 1955 | 164 |
| 1956 | 200 |
| 1957 | 222 |
| 1958 | 178 |
| 1959 | 194 |
| 1960 | 188 |
| 1961 | 162 |
| 1962 | 222 |
| 1963 | 208 |
| 1965 | 133 |
| 1966 | 176 |
| 1968 | 177 |
| 1969 | 199 |
| 1970 | 178 |
| 1978 | 187 |
| 1981 | 196 |
| 1982 | 190 |
| 1983 | 199 |
| 1984 | 175 |
| 1988 | 196 |
| 1990 | 192 |
| 1992 | 231 |
| 1994 | 222 |
| 1995 | 190 |
| 1996 | 180 |
| 1997 | 182 |
| 1998 | 206 |
| 1999 | 224 |
| 2000 | 220 |
| 2001 | 229 |
| 2004 | 232 |
| 2006 | 194 |
| 2007 | 229 |
| 2008 | 173 |
| 2009 | 200 |
| 2010 | 212 |
| 2011 | 205 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1928 | 20.5 °C |
| 1951 | 19.8 °C |
| 1952 | 20.8 °C |
| 1953 | 19.9 °C |
| 1954 | 19.4 °C |
| 1955 | 19.2 °C |
| 1956 | 20.5 °C |
| 1957 | 19.9 °C |
| 1958 | 20.8 °C |
| 1959 | 19.7 °C |
| 1960 | 20.7 °C |
| 1961 | 20.2 °C |
| 1962 | 19.9 °C |
| 1963 | 19.8 °C |
| 1965 | 18.2 °C |
| 1966 | 21.1 °C |
| 1968 | 18.5 °C |
| 1969 | 20.6 °C |
| 1970 | 18.8 °C |
| 1971 | 18.8 °C |
| 1978 | 19.3 °C |
| 1979 | 20.3 °C |
| 1982 | 19.3 °C |
| 1983 | 19.0 °C |
| 1984 | 19.1 °C |
| 1988 | 20.9 °C |
| 1989 | 20.6 °C |
| 1991 | 20.0 °C |
| 1992 | 21.8 °C |
| 1994 | 22.1 °C |
| 1995 | 19.9 °C |
| 1996 | 20.8 °C |
| 1997 | 20.4 °C |
| 1998 | 20.1 °C |
| 1999 | 19.6 °C |
| 2000 | 22.5 °C |
| 2001 | 22.4 °C |
| 2002 | 21.8 °C |
| 2004 | 20.7 °C |
| 2005 | 20.4 °C |
| 2006 | 21.6 °C |
| 2007 | 22.4 °C |
| 2008 | 20.6 °C |
| 2009 | 20.3 °C |
| 2010 | 19.6 °C |
| 2011 | 19.5 °C |
| 2012 | 21.7 °C |
| 2013 | 21.0 °C |
What this means for you: Since 1925, Magna's last spring frost has come about 1 day earlier per decade, on average. The frost-free season has grown by about 3 days per decade. Year-to-year swings are large, so keep using the safe date rather than the trend.
Source: daily records from Garfield (NOAA GHCN-Daily). Years with too many missing days are left out.