Utah · zones 6a–8b
When to plant carrots in Utah.
Sow between Mar 24 to Apr 26 in a typical year, keyed to Utah's median last frost around May 1. A second, fall sowing fits Jul 10 to Aug 5. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Carrots dates for a typical Utah season.
Direct sow
Mar 24 to Apr 26
Keyed to the ~May 1 last frost. Sow 0.25" deep, 2" apart.
Fall round
Jul 10 to Aug 5
Counted back from the ~Oct 5 first frost.
Harvest
~68 days later
~0.2 lb per plant over ~2 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.
Utah growing notes
Utah's bench soil decides if a carrot grows straight.
Alluvial bench ground is rockier than it looks
A lot of Wasatch Front gardens sit on old alluvial fan and bench soil, deposits laid down by mountain streams over thousands of years, which look like fine dirt on the surface but often carry a layer of rock and gravel within the first foot down. A carrot root that hits that layer forks or stops rather than growing the long, straight taproot a gardener is after, even in a bed that looked perfectly workable from the surface.
Digging a test hole a foot deep before committing a bed to carrots is worth the 10 minutes it takes, since finding the gravel layer before planting means a grower can either build a raised bed above it or pick a shorter, blockier variety suited to shallower ground, rather than discovering the problem at harvest when every root has forked around a stone.
Canal water salt shows up in the shape of the root, not just the leaves
Carrots rank among the more salt-sensitive root crops, and a lot of Utah gardens water from a shared ditch or canal system carrying real dissolved mineral content, well above what a municipal tap delivers. A root pulling in that mineral load through an uneven watering routine often comes up rougher-skinned or visibly twisted even when the leafy top looks completely normal, and a crusty white residue building up on the bed surface between waterings is the sign that salt is accumulating faster than the bed drains it away.
Watering deeply and less often, rather than lightly every day or two, pushes salt down past the root zone instead of letting it build up where the carrot is actually growing, and a 2-inch mulch layer slows the surface evaporation that pulls those salts back toward the top of the bed between waterings.
Five rounds and a fall sweetness worth waiting for
Utah's compressed season still supports about 5 carrot sowings from spring through late summer, spaced a few weeks apart, which keeps a steady supply coming rather than one large harvest all at once. Once the tops stand about 2 inches high, thin the row to a 2-inch spacing by snipping each unwanted seedling right at ground level rather than tugging it out, since yanking a seedling free disturbs the neighboring roots more than a clean cut ever does.
The last round of the year is worth timing deliberately: as soil cools at root depth, the plant converts stored starch to sugar as a natural antifreeze. Dig after Utah's first fall frost has nipped the tops but before the bench ground itself locks up hard, and taste one against a root pulled from an earlier summer round, since the difference settles it faster than any thermometer reading would. Carrot rust fly and parsleyworm both show up here; a floating row cover from sowing through harvest handles the fly, while a weekly hand check for the green-and-black parsleyworm caterpillar usually catches it before it strips much foliage.
In Utah: watch for
The pests that find carrots here.
A middle-length season, about 157 frost-free days, means carrot overlaps carrot rust fly for a stretch each summer. Check plants every week or two and treat early.
Rusty tunnels in the roots and stunted tops.
Organic fix: Cover the row; rotate away from last year's carrots.
Big green-and-black striped caterpillars on the foliage.
Organic fix: Handpick (or leave for swallowtails); Bt if heavy.
Brown spots ringed in yellow on the oldest leaves first, darkening until the tops look scorched.
Organic fix: Water at the base rather than overhead, turn under old carrot tops, and leave 2 years between carrot crops.
Your season math: Utah gives carrots about 157 frost-free days, and it needs roughly 68 days to a first harvest. That fits about 5 re-sown rounds across the season, so you can keep it coming instead of picking once.
Planting carrots in Utah: questions
When should I plant carrots in Utah?+
In a typical Utah year, sow carrots between Mar 24 to Apr 26, keyed to the state's median last frost around May 1. There's also a fall window: Jul 10 to Aug 5. Your exact dates shift with your ZIP code and microclimate.
What USDA zone is Utah?+
Utah spans zones 6a–8b, mostly zone 6. But frost dates, not zones, set planting time. The free planner uses your ZIP code's actual frost dates.
How many carrots plants do I need?+
Depends who you're feeding. The crop page has exact counts per household size, or the free planner does the math for your family in about 60 seconds.