County Fair Guide

Union County Fair

Alcester, South Dakota

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2026 Dates

Jul 30 – Aug 1, 2026

Duration

3 days

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Size

small

About Union County Fair

The Union County Fair in Alcester is a three-day late-July celebration in South Dakota's southeastern corner where the Big Sioux and Missouri rivers meet near the Nebraska and Iowa borders.

What to Expect

Expect livestock judging, 4-H competitions, carnival rides, and the community spirit of a river-country county shaped by agriculture and the Missouri River.

Visitor Tips

Alcester is in the corner of South Dakota nearest to Sioux City, Iowa — the Missouri River and the Lewis and Clark route pass through Union County.

Places to Stay Nearby

Find hotels and vacation rentals close to Alcester.

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