At the Cal-Neva Marathon near Lake Tahoe, the organiser asks runners to wear a headlamp and safety flashers for the first hour and to keep to the left side of the road, facing the oncoming cars. The road stays open for the race. The course page warns, "In some spots, the shoulder is very narrow."
About 150 people run Cal-Neva. Chicago has 55,000 and starts them in waves from corrals that open hours before the gun. A marathon of a few hundred runners keeps its aid stations and its timing. The crowd thins out, the pace groups disappear, and the road often stays open to traffic. A qualifying time run at one can still count for Boston, whose rules need only three runners on the start line.
What counts as a small marathon?
Among the marathons on 42cal that publish a field size, the median has about 6,000 runners. Small, in what follows, means fewer than 1,000 runners, and only about one in eight marathons is that size.
The smallest on 42cal's list is the Maya Marathon in Cozumel, Mexico, with 50 runners. The races described below have between about 120 and 400.
Signing up on race morning
In Sweden, the club behind the 128-runner Mariestads Marathon takes entries on race day until 9:00 a.m. Late entrants pay an extra 100 kronor on top of the regular fee. By nine on race morning in Chicago, the last of its three waves has already started.
The road stays open to traffic
The Hyannis Marathon, with 386 runners, puts it plainly on its registration page: "The course is not closed to traffic; however, the traffic is very light on most of the route." Police and volunteers watch the course.
In Juneau, Alaska, 242 runners race along the lightly traveled, two-lane Douglas Highway. The rules keep them on the shoulder, the bike lane or the sidewalk, and they may not cross the white fog line into the lane of traffic.
The 200 runners at the WhistleStop Marathon in Ashland, Wisconsin, spend almost all of the race on the Tri-County Corridor, a multi-use trail where ATVs are allowed. The organisers expect few outside ATVs on race day. Crossing guards stop traffic at the significant intersections. Some rarely traveled forest roads have no guard, and the guide asks runners to take normal care when crossing. It also warns of occasional varmint holes, which the organisers try to patch before race day, though "animals are known to be persistent."
Racing on a public road gives the road authority a say. The organiser's page for the 2024 Cal-Neva Marathon is titled "Cal-Neva Marathon 2024 - canceled by Caltrans," and gives no other explanation. Caltrans is California's state transportation department.
Volunteers and aid stations
The Clarence DeMar Marathon in Keene, New Hampshire, reports more than 300 volunteers. They cover a half marathon as well as the marathon, whose field is 308.
WhistleStop thanks nearly 500 volunteers, a number that also covers its half marathon, 10K and 5K. Each of its aid stations carries bandages, Vaseline and a pain reliever, and has portable toilets.
WhistleStop's event guide asks an injured runner to walk to the next aid station or to ask another runner to tell that station to send help. A vehicle drives between the stations to pick up anyone who cannot finish.
Water comes about as often as at a big race. DeMar puts it out about every 1.5 miles, and Chicago spaces its aid stations approximately one to two miles apart. The leanest course here is Cal-Neva's, with six stations about four miles apart.
No pace groups to follow
The Clarence DeMar FAQ answers the question about pace groups in two words: "Unfortunately no." Chicago runs free pace groups for finish times from 2:55 to 6:00. 42cal's guide to how marathon pacers work covers what a pace group does for the runners in it.
In a field of a few hundred, a runner can go miles with nobody close enough to follow or to tuck in behind. Running behind someone saves energy against the air, and the saving shrinks as the pace slows, because drag rises steeply with speed. The estimates gathered here are all for elite speeds, so none of them says how much a four- or five-hour runner gives up by running alone.
Hardly any spectators
42cal gives most of the marathons on its list an editorial crowd rating from 1 to 10, and the average falls as the field shrinks. Among the small races, two in Sweden, Mariestads and SäterMaran, get the lowest score of 1.
A 2019 study by Tao Bi and colleagues, presented at the CHI conference in Glasgow, interviewed seven runners and five spectators. Its focus was runners and the friends and family who came to watch them, more than the crowd at large.
One runner, passing people they knew, "waved at them and started to run faster." Others found the cheering a strain when they were managing their pace around pain. One said of the people urging them on, "They didn't know my real condition that I was in pain."
The study is qualitative and recorded no finish times, so it cannot say whether a quiet course is slower, only that cheering helps some runners and bothers others.
The typical cut-off matches the big races
Small races are no harder on slow runners. On 42cal, the median cut-off is six hours at every field size.
Juneau is the one small marathon on 42cal with no cut-off at all. Its race page says "the finish line does not shut down until the last runner is in."
Clarence DeMar allows seven hours, and Hyannis a strict six. Hyannis runners who expect to need more than five hours can start half an hour before the main field.
Does a small marathon count for Boston?
The B.A.A.'s 2026 rules for a qualifying race set a floor on the field: "A minimum of three official participants must start the race." The course must be certified by USATF, AIMS or a national governing body, and the race must be advertised before race day. Timing can come from a transponder system or from written check sheets at every 5K checkpoint.
Small races hold these certificates and publish them. Clarence DeMar lists its USATF certificate, NH25006JK, and answers the Boston question in its FAQ: "Absolutely. In fact, that's what brings many of our runners to DeMar." Juneau's marathon course is certified as AK25009FW. Hyannis advertises itself as a "Boston Marathon Qualifier - 6 Hour Course Time Limit."
42cal's Boston qualifier calculator gives the time to aim for. The B.A.A. leaves the checking to the runner: "It is the athletes' responsibility to confirm a marathon course has a current certification." At a race this size, that means asking the race director for the certificate number before training for it.
Further reading
- B.A.A. 2026 Boston Marathon Rules and Policies: the three-starter minimum, certification and timing requirements for a qualifier.
- Clarence DeMar Marathon FAQs: the pace-group answer, certificate numbers and volunteer count for a 308-runner race.
- Cal-Neva Marathon: course rules for a 150-runner race run on an open highway shoulder.
- WhistleStop Marathon 2026 Event Guide: aid, traffic, varmint holes and the 2:30 p.m. cut-off.
- Hyannis Marathon on Race Roster: the open-traffic statement and the strict six-hour limit.
- Chicago Marathon race day timeline: corral and wave times for a field of about 55,000.
- Chicago Marathon course and amenities: the 20 aid stations, one to two miles apart.
- Bi and colleagues, CHI 2019: interviews with seven runners and five spectators on cheering.
- Soares da Silva, Kram and Hoogkamer preprint: the metabolic cost of air resistance in distance running.
