The best time to plant tomatoes in Utah is generally after the last frost date, which varies by location but typically falls around mid to late May. Many gardeners follow the advice to plant tomatoes outside after Mother's Day (around May 13) to avoid frost damage. For example, in Salt Lake City and nearby areas, the last frost date ranges from late April to mid-May, so planting tomatoes after this frost-free period is safest. Starting seeds indoors can be done in late March, with transplanting outdoors timed around mid to late May, when the soil is warm and the risk of frost has passed. Specifically:
- Last frost dates in Utah vary by city (e.g., Salt Lake City April 22 to May 14 in some microclimates).
- Tomatoes can be planted outdoors safely after mid-May or when snow is off the Oquirrh Mountains.
- Starting seeds indoors in late March to early April is recommended.
- Protect young plants with row covers if planting before the frost-free date.
This timing offers the best chance for healthy tomato growth and good yields in Utah's climate.
