City	Sow outdoors	Last frost
Salt Lake City	Mar 31 to Apr 14	Mar 31
West Valley City	Apr 8 to Apr 22	Apr 8
West Jordan	Apr 18 to May 2	Apr 18
Provo	Apr 18 to May 2	Apr 18
St. George	Mar 14 to Mar 28	Mar 14
Lehi	Apr 30 to May 14	Apr 30
Orem	Apr 19 to May 3	Apr 19
Sandy	Apr 29 to May 13	Apr 29
Ogden	Apr 21 to May 5	Apr 21
South Jordan	Apr 18 to May 2	Apr 18
Layton	Apr 29 to May 13	Apr 29
Eagle Mountain	Jun 2 to Jun 16	Jun 2
Millcreek	Apr 25 to May 9	Apr 25
Herriman	Apr 18 to May 2	Apr 18
Saratoga Springs	Apr 30 to May 14	Apr 30
Taylorsville	Mar 31 to Apr 14	Mar 31
Logan	May 8 to May 22	May 8
Murray	Apr 29 to May 13	Apr 29
Draper	Apr 18 to May 2	Apr 18
Spanish Fork	Apr 25 to May 9	Apr 25
Riverton	Apr 18 to May 2	Apr 18
Bountiful	Apr 25 to May 9	Apr 25
Tooele	May 2 to May 16	May 2
Cedar City	May 4 to May 18	May 4
American Fork	Apr 17 to May 1	Apr 17
Syracuse	Apr 22 to May 6	Apr 22
Roy	Apr 22 to May 6	Apr 22
Pleasant Grove	Apr 17 to May 1	Apr 17
Washington	Mar 14 to Mar 28	Mar 14
Midvale	Apr 29 to May 13	Apr 29
Springville	Apr 18 to May 2	Apr 18
Kearns	Apr 8 to Apr 22	Apr 8
Magna	Apr 3 to Apr 17	Apr 3
Clearfield	Apr 29 to May 13	Apr 29
Kaysville	Apr 19 to May 3	Apr 19
Cottonwood Heights	Apr 29 to May 13	Apr 29
Holladay	Apr 29 to May 13	Apr 29
South Salt Lake	Mar 31 to Apr 14	Mar 31
Farmington	Apr 19 to May 3	Apr 19
Hurricane	Apr 1 to Apr 15	Apr 1
West Haven	Apr 22 to May 6	Apr 22
Payson	May 4 to May 18	May 4
Clinton	Apr 22 to May 6	Apr 22
North Salt Lake	Apr 24 to May 8	Apr 24
North Ogden	Apr 19 to May 3	Apr 19
Highland	May 3 to May 17	May 3
Brigham City	May 5 to May 19	May 5

Questions

When should I plant dill in Utah?

In Salt Lake City, sow outdoors from March 31 to April 14. Across Utah the window opens between March 14 and June 2, depending on the local last frost.

How is this date worked out?

Sow outdoors up to 2 weeks after the last frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.