Utah · zones 6a–8b
When to plant tomatoes in Utah.
Sow or transplant between May 8 to Jul 8 in a typical year, keyed to Utah's median last frost around May 1. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Tomatoes dates for a typical Utah season.
1 · Start indoors
Mar 27 to May 27
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
May 8 to Jul 8
Keyed to the ~May 1 last frost. Sow 0.25" deep, 24" apart.
Harvest
~73 days later
~12 lb per plant over ~8 weeks.
Utah spans more than one climate: Zone 6 is the most common zone, but the state runs 6a to 8b. That's why the planner works from your ZIP code's frost dates, not your zone — mountain and coastal gardens in the same state can be three weeks apart.