The sixth running of the Loud Thunder 50 returned to the wooded bluffs of Illinois City on Saturday 18 April 2026, sending fields across the 50-mile, 50-kilometre and half marathon distances on to a single-track loop course carved through the Loud Thunder Forest Preserve along the Mississippi River. The race has quietly established itself as one of the Midwest's more distinctive spring ultras, offering a technical trail experience rarely associated with central Illinois.
All three race distances share the same 13.3-mile loop, which is roughly 95 per cent trail and rolls between hardwood ridgelines and oxbow overlooks above the Mississippi. The 50-mile field, which started at 6am, tackled three full loops plus a shortened fourth loop totalling over 6,000 feet of elevation gain and loss, with a fourteen-hour cut-off. The 50k runners, away at 8am, ran two standard loops plus a shortened third loop for around 4,000 feet of climbing, and the half marathon, starting at 9am, covered a single loop inside the same 8pm daylight cut-off.
Organisers kept the entry cap modest again this year to protect the single-track, which can become rutted after spring rains, and to maintain the small-field atmosphere that regulars have come to expect. Aid stations were spaced roughly every four miles along each loop, a setup that suits the race's tendency to attract first-time 50-mile entrants looking for an accessible but genuinely challenging debut. Volunteer hours, as in previous editions, were drawn largely from the Quad Cities running community, with local clubs staffing the start-finish area and the two remote aid stations on the far side of the preserve.
Conditions on race morning were cool and overcast with temperatures in the low 40s (Fahrenheit) and intermittent showers passing through the preserve in the afternoon, making the exposed ridge sections slick but not dangerously so. The course's long rolling descents to the river beaches are typically where runners lose the most time when the trail is wet, and several 50-mile competitors reported splits slowing noticeably on the third loop as the singletrack softened.
Full results for all three distances are being published on the UltraSignup and RunSignup event pages as timers process splits through the final 50-mile cut-off. The race once again served as an early-season tune-up for runners building towards summer Midwest ultras such as Kettle Moraine and Howl at the Moon, and organisers have already confirmed dates for a seventh edition in April 2027. For a race that operates out of a 1,800-acre county preserve with no permanent infrastructure, Loud Thunder's steady growth remains one of the more understated success stories in Midwest trail running.