When to Plant Carrots in Logan, UT
Published: April 21, 2026
Carrot Planting Dates for Logan, UT
| Start seeds indoors | Year-round |
| Last frost (average) | April 7 |
| Direct sow outdoors | March 10–20 |
| Minimum soil temperature | 45°F |
| Expect first harvest | May 19 – May 29 |
| Fall crop planting | August 13–23 |
| Fall crop harvest | October 22 |
| First fall frost (average) | October 22 |
Best Carrot Varieties for Logan, UT
For Zone 5b Logan, the best-performing carrot varieties are Bolero, Chantenay, and Merida — all short-season varieties chosen for cool-climate reliability. These varieties are typically stocked by local nurseries and are the safest bets for gardeners new to carrot in Logan.
Growing Carrots in Logan
Logan sits in Zone 5b, with an average last frost of April 7 and first fall frost around October 22 — giving a 198-day frost-free growing season. Cool-season crops like carrot benefit from Logan's cooler spring and fall windows, when temperatures stay in the 55–75°F sweet spot that produces the best flavor and least bolting.
Logan's cooler summers are close to ideal for carrot. The same conditions that limit tomato and pepper yields benefit cool-season crops — slower bolting, sweeter flavor, and longer harvest windows. The fall carrot crop in Logan is often more productive than the spring crop.
Logan's caliche soil is rock-hard below the surface — raised beds filled with quality potting mix are the most practical approach for carrot. Breaking through caliche for in-ground planting requires significant soil amendment, gypsum application, and deep tilling over several seasons. Water at 1 inches per week delivered through drip irrigation for best results in a raised-bed system.
Carrot Calendar for Logan
| Month | Task |
|---|---|
| Year | Start seeds indoors under grow lights |
| April | Last frost — soil warming, prepare bed |
| March | Direct sow seeds into warm soil |
| May | Expect first harvest window to open |
| August | Start fall crop — transplants or direct sow |
| October | First fall frost — harvest remaining, end of outdoor season |
Carrot Tips for Logan Gardeners
- •Direct sow ONLY — transplanting carrots causes forked, misshapen roots every time.
- •Soil must be loose and rock-free to at least 12 inches deep; raised beds are ideal.
- •Fall plantings in Logan often out-produce spring plantings — cooler temperatures slow bolting and concentrate flavor. Light frost can actually improve the taste of carrot.
Common Carrot Pests in Logan
- •Carrot Fly — peaks July in Zone 5b (active June–August); larvae tunnel through roots; use row covers or plant near onions to deter adults.
- •Wireworm — peaks July in Zone 5b (active June–August); orange-brown beetle larvae in soil; trap with cut potato pieces buried in soil.
- •Leaf Blight — peaks July in Zone 5b (active June–August); dark spots on leaves spreading from bottom up; remove affected foliage and apply copper fungicide.
Check plants every 2–3 days during peak season — early intervention prevents most infestations from becoming serious.
What to Plant with Carrots in Logan
In Logan's cold climate, Tomato and Onion are the most beneficial plants to grow alongside carrot. Tomato repels carrot fly while benefiting from nearby aerated soil. Keep carrot away from Dill — it competes for nutrients or shares pest pressure. In short-season gardens, interplanting companions at transplant time maximizes each bed's productive weeks.
Frequently Asked Questions
When should I plant carrot in Logan, UT?
In Logan (Zone 5b), direct sow carrot around March 10–20. Soil must be at 45°F or warmer at 2-inch depth before sowing — cold soil rots the seeds.
What zone is Logan, UT for carrot growing?
Logan is USDA Zone 5b. For carrot, this means a frost-free growing season of roughly 28 weeks running from April 7 to October 22. Cool-season crops like carrot thrive in this zone with both spring and fall planting windows available.
When is carrot harvest season in Logan?
Expect the first carrot harvest in Logan around May 19, with harvest continuing through May 29. This is based on 70–80 days from transplant or direct sow. A fall crop planted August 13–23 adds a second harvest around October 22.
How long does it take to grow carrot in Logan, UT?
From transplant or direct sow to first harvest, carrot takes 70–80 days in Logan's climate. Based on a typical planting date of March 10–20, expect your first harvest around May 19. Logan's cooler Zone 5b climate often lands at the slower end of this range — cooler nights slow fruit development.
What soil does carrot need in Logan?
Logan's caliche subsoil is effectively rock — traditional in-ground planting of carrot produces poor results. Build a raised bed with 12–18 inches of quality potting mix or Mel's Mix for reliable production. Break through caliche only for deep-rooted crops, and expect to add compost each year to offset the alkalinity.