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Posted by: Dennis Hinkamp on Apr 26, 2013

Plant Now or Wait ?

Contact: Taun Beddes, USU Extension horticulturist 

 

  taun.beddes@usu.edu, 801-851-8460

Julene Reese, USU Extension writer   

julene.reese@usu.edu, 435-797-0810



Thursday, April 25, 2013
 

 

 When Should I Plant My Garden?

Determining when to plant a garden can be somewhat confusing in Utah’s unpredictable, varied climate where last-frost dates can vary by many days within just a few miles. Many experienced gardeners have planted at one point and later lost the plants to frost.

An example of how fickle Utah’s climate can be is in Cache Valley. Frost-free days vary from an average of 113 days in Lewiston and Trenton to 158 days on the USU campus. Similar examples occur across the state. Although exact last-frost dates are not available for all areas, a person can still determine when to plant. Often, the best thing to do is chat with a local farmer or experienced gardener in the area. 

Consider the geographic characteristics of where you live. When a yard is located in a populated area or on a mountain bench, it usually has a longer growing season. Other areas located at slightly lower elevations, where cold air drains and cannot escape, have a shorter season due to the increased cold air. This is why local commercial orchards are generally located on benches. Additionally, urban and suburban areas are slightly warmer than surrounding areas due to the urban heat effect. Heat from buildings and warmth generated by sunlight reflected from roads and other surfaces increase temperatures and delay frost.

In addition to knowing frost information, a wise gardener takes into account the needs of the plants. Vegetables planted locally fall into four basic categories: hardy, semi-hardy, tender and very tender. Depending on the category, planting dates vary from early spring until early summer. Consider the following:

  Hardy vegetables, including asparagus, broccoli, cabbage, onions, peas and spinach, can be planted as soon as the soil is workable in early spring. This usually ranges between 45 and 60 days before the average last frost. These same vegetables can be safely planted until the date of the average last frost. 

  Semi-hardy plants, such as beets, carrots, lettuce and potatoes, can be planted one to two weeks after the hardy group. These can be planted until the average last-frost date.

  Tender vegetables, such as celery, cucumbers, corn and most beans, should be planted on the average last-frost date in your area. 

  Very tender plants, such as squash, beans, melons, tomatoes, eggplants and peppers, should not be planted until at least a week after the average last frost has passed. Even if frost does not occur before this time, these plants will not grow well and are more susceptible to disease until warmer weather. 


If you have lost plants to frost, you are not alone. It is often due to Utah’s fickle weather, and all gardeners can do is try again. 

 

Frost Information for Various Locations in Utah

 

 

Frost Dates

 

City

Last

First

Frost-Free Days

Alpine

May 20

September 30

136

Blanding

May 13

Oct 12

153

Cedar City

May 10

October 5

148

Delta

May 17

September 28

134

Farmington

May 5

October 10

158

Fillmore

May 16

October 4

140

Huntsville

June 11

September 9

  89

Kanab

May 7

October 20

166

Lake Town

June 15

September 10

   87

Logan

May 14

September 25

135

Morgan

June 6

September 11

 98

Moroni

June 1

September 18

109

Ogden

May 1

October 24

176

Park City

June 9

September 1

   92

Price

May 12

October 7

148

Roosevelt

May 18

September 25

130

Spanish Fork

May 1

October 13

165

St. George

April 6

October 28

205

Tooele

May 7

October 14

159

Comments

Deb said...

I have done a pre emergent on my lawn. Is it too early to turn on my water for the sprinkler system. Or will it freeze? Thanks. Deb
April 29, 2013 4:57:00 PM MDT
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