The Short Answer
Up to 100K you do not need a crew, and most runners never have one. Beyond that the case gets stronger with every hour: for a 100-mile race, a 24-hour race, or a backyard ultra past the first night, a crew is the single biggest logistical advantage you can bring. Always confirm what the race allows: some events restrict crew to specific points, some ban outside assistance, and self-supported stage races forbid it entirely.
Crew Importance by Format
| Format | Crew needed? | Why |
|---|---|---|
| 50K / 50 miles | No | Aid stations and one drop bag cover a daylight race |
| 100K | No, but useful | Helpful for a light and layer change if you finish after dark |
| 100 miles | Yes, if allowed | Night section, shoe changes, and decision fatigue; a pacer for the second half if permitted |
| 24-hour race | Strongly recommended | Short loop means a crew can prepare food and layers every lap and cut stopped time |
| Backyard ultra | Essential past about 24 yards | You have 5 to 15 minutes per hour; a crew hands you what you need so you can sit |
| 6-day race | Yes, or a rehearsed solo system | A week of meals, laundry, sleep wake-ups, and foot care |
| Self-supported stage race | Not allowed | You carry everything; the organizer provides water and shelter |
What a Good Crew Actually Does
A crew removes decisions. Late in an ultra, simple tasks become expensive: opening bags, finding dry socks, remembering how much you ate, or deciding whether to add a jacket before the temperature drops. A good crew turns those choices into a repeatable system, so that every stop costs two minutes instead of ten.
- Has the next tested food, drink, and caffeine ready before you arrive
- Records intake, bathroom stops, and unusual behavior so you do not have to remember
- Handles foot care access, sock swaps, backup shoes, and layer changes
- Keeps stops short while allowing rest or assessment when you need it
- Watches for medical red flags and sends you to race medical staff rather than diagnosing
Give your crew a written plan: what you want at each stop, what to do if you refuse food, and which symptoms mean the race is over. Our crew and aid station guide has a template.
Racing Solo Successfully
Solo racing works when you remove decisions before the start. Pack by time block rather than by product type: early race, night, cold weather, foot care, emergency food. Put written instructions in each bag so you do not have to remember the plan when you are tired. Confirm what the aid stations actually stock, and set flexible reminders for eating, drinking, and foot checks rather than trusting your judgment at 3 a.m.
If the race allows drop bags, keep them boring and obvious. Use large labels, transparent bags, and duplicates of the items that end races: socks, lubricant, batteries, and familiar food. Solo runners rarely lose time because something is missing; they lose it because everything is technically packed and impossible to find quickly.
Sources
- International Association of Ultrarunners — 24-hour format overview, including crewed and self-supported setups
- International Association of Ultrarunners — competition and technical documents; the rules for the specific event remain controlling
- Big's Backyard Ultra — official backyard ultra rules, including crew and camp provisions