100-Mile Race Crew Guide: Jobs, Timing, and Boundaries

Quick answer

A good crew reduces decisions without taking ownership away from the runner. The useful work happens before race day: learning the rules, assigning roles, preparing each legal access point, and agreeing on what the crew should do when the runner is tired, late, cold, discouraged, or unable to explain a problem clearly.

Begin with the race rules

Mark crew-access stations, parking restrictions, road closures, vehicle limits, pacer rules, prohibited assistance, and areas where spectators are not allowed. Crewing outside legal zones can endanger participants, burden volunteers, or cause a penalty.

Assign one decision lead

One person should maintain the schedule and make the final call on crew logistics. Other roles can include driving, food and fluids, gear, foot-care supplies, and recording what the runner actually consumed. Clear roles prevent five people from asking five questions at once.

Pack by access point

Use labeled station bags or bins rather than one vehicle-sized pile. Put the likely clothing, lighting, batteries, food, and foot-care items for that point together. Add a short checklist of what must leave with the runner.

Use arrival windows

The runner may be hours ahead of or behind the optimistic schedule. Give each station an early and late window, travel time, parking buffer, and a fallback if the crew misses the runner. The runner must still be able to continue using race support.

Agree on communication boundaries

Decide how direct the crew should be about time, eating, warmth, and medical concerns. Encouragement should not become pressure to ignore dangerous symptoms or race officials. The crew supports decisions; it does not diagnose or override event safety personnel.

The practical takeaway

The best crew is organized, rule-aware, calm, and replaceable by the event’s aid system if travel or timing goes wrong.