When to Plant Sweet Corn in Logan, UT
Published: April 24, 2026
Sweet Corn Planting Dates for Logan, UT
| Start seeds indoors | Year-round |
| Last frost (average) | April 7 |
| Direct sow outdoors | April 14–24 |
| Minimum soil temperature | 60°F |
| Expect first harvest | June 18 – July 13 |
| First fall frost (average) | October 22 |
⚠ Direct sow corn after last frost when soil reaches 60°F. Plant in blocks of at least 4 rows for pollination. Succession plant every 2 weeks for continuous harvest.
Best Sweet Corn Varieties for Logan, UT
Consult a Logan-area nursery or your state extension office for sweet corn varieties proven in Zone 5b.
Growing Sweet Corn 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. Warm-season crops like sweet corn need soil at 60°F or above before transplanting; Logan's frost calendar puts that window clearly in the late-spring to early-fall range.
Logan's short growing season makes indoor seed starting essential for sweet corn. Missing the Year-round start date by even two weeks often means plants do not reach producing size before the first fall frost shuts them down. Row covers and cold frames extend both ends of the season by 2–3 weeks each.
Logan's caliche soil is rock-hard below the surface — raised beds filled with quality potting mix are the most practical approach for sweet corn. Breaking through caliche for in-ground planting requires significant soil amendment, gypsum application, and deep tilling over several seasons. Water at 1.5 inches per week delivered through drip irrigation for best results in a raised-bed system.
Sweet Corn Calendar for Logan
| Month | Task |
|---|---|
| Year | Start seeds indoors under grow lights |
| April | Direct sow seeds into warm soil |
| June | Expect first harvest window to open |
| October | First fall frost — harvest remaining, end of outdoor season |
Sweet Corn Tips for Logan Gardeners
- •Plant in blocks of at least 4 rows × 4 plants, not single rows — corn is wind-pollinated and single rows produce deformed ears.
- •Sow successively every 2 weeks until 90 days before first fall frost for continuous harvest through summer.
- •Cover transplants with floating row covers for the first 2–3 weeks after setting them out in Logan. The 3–5°F of extra warmth dramatically improves early establishment.
Common Sweet Corn Pests in Logan
- •Corn Earworm — peaks July in Zone 5b (active June–August); monitor closely during peak season and treat early.
- •Cutworm — peaks July in Zone 5b (active June–August); cuts seedlings at soil line; protect stems with paper collars or diatomaceous earth.
- •Corn Rootworm — peaks July in Zone 5b (active June–August); monitor closely during peak season and treat early.
Check plants every 2–3 days during peak season — early intervention prevents most infestations from becoming serious.
What to Plant with Sweet Corn in Logan
In Logan's cold climate, Bush Bean and Pumpkin are the most beneficial plants to grow alongside sweet corn. Bush Bean improves nearby plant health and pest resistance. Keep sweet corn away from Tomato — 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 sweet corn in Logan, UT?
In Logan (Zone 5b), direct sow sweet corn around April 14–24. Soil must be at 60°F or warmer at 2-inch depth before sowing — cold soil rots the seeds.
What zone is Logan, UT for sweet corn growing?
Logan is USDA Zone 5b. For sweet corn, this means a frost-free growing season of roughly 28 weeks running from April 7 to October 22. This is a tight window for warm-season crops like sweet corn — short-season varieties maximize harvest.
When is sweet corn harvest season in Logan?
Expect the first sweet corn harvest in Logan around June 18, with harvest continuing through July 13. This is based on 65–90 days from transplant or direct sow.
How long does it take to grow sweet corn in Logan, UT?
From transplant or direct sow to first harvest, sweet corn takes 65–90 days in Logan's climate. Based on a typical planting date of April 14–24, expect your first harvest around June 18. Logan's cooler Zone 5b climate often lands at the slower end of this range — cooler nights slow fruit development.
What soil does sweet corn need in Logan?
Logan's caliche subsoil is effectively rock — traditional in-ground planting of sweet corn 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.