Monumental vs CIM: Which Late Fall BQ Race Wins?

Published October 11, 2026 · Estimates, updated each registration cycle

Short answer: both are among the best Boston qualifiers in the country, and the gap between them is smaller than forum threads suggest. Pick Indianapolis Monumental if you want a truly flat course and a race four weeks earlier. Pick the California International Marathon if your legs handle rolling descents and you want the most reliable cool, dry morning in American road racing. Monumental runs on Saturday, November 7, 2026 and CIM on Sunday, December 6, 2026. Both finish after the Boston 2027 registration closed, so both count toward the application you file in September 2027 for the 2028 Boston Marathon. Whichever you choose, the goal is not the standard, it is a buffer under it.

Course profile

Monumental is flat in the literal sense. It starts and finishes downtown, heads north through the neighborhoods and back, and there is no climb on it worth a pacing plan. CIM runs point to point from Folsom to the state capitol in Sacramento and loses about 340 feet net. That sounds like free time, and partly it is, but the first half is a sequence of short rollers rather than a smooth ramp. The descents load the quads for two hours and the flat final miles then ask for turnover on tired legs. Runners who trained on hills tend to run a little faster at CIM. Runners whose quads fade late tend to do better at Monumental. Neither course is close to the 1,500 foot net drop that triggers the Boston downhill adjustment, so both submit at full clock value, see which marathons are too downhill.

Weather

Both races sit in the coldest useful part of the calendar. Indianapolis in early November is usually in the 30s or low 40s Fahrenheit at the start, and the realistic bad day is wind or a cold rain rather than heat. Sacramento in early December is typically in the 40s with little wind, which is why CIM has the stronger reputation for reliability. CIM has also had rain and headwind years, so neither race is a guarantee. On average CIM is a slightly safer bet on weather, and Monumental a slightly safer bet on terrain.

Field and pacing

Both races are built around people running for a number. Each has spent years near the top of the American list for Boston qualifiers produced, and both offer pace groups at the common Boston times, so you are unlikely to run the last ten miles alone at either. Monumental also hosts a half marathon on the same morning, which thins the marathon field after the split. CIM is a single race with a deep marathon field all the way to the capitol. Entry availability changes through the fall, so check both registration pages before you decide.

Timing and your backup plan

Four weeks is the real difference. With Monumental about four weeks away in mid October, a runner who is already fit gets the race done before the holidays and keeps both a spring backup and the summer of 2027 open. CIM gives about eight weeks, which is enough for one more block of marathon specific work if your fitness is still coming up. Either way the 2028 window is long, so a miss is not the end of the cycle, see the 2028 qualifying window.

The number to aim at

The 2027 Boston race cut at 5:17 under the standard, after 4:34 for 2026. The 2028 cutoff is not known yet, so any target is a planning number, not a forecast. Take a 40 year old woman, standard 3:35:00. With a planning buffer of 6:00, above both recent cutoffs, she would aim for 3:29:00, which is 7:58 per mile and about 1:44:30 at halfway on an even split. At CIM, hold that pace honestly on the early rollers instead of banking time on the descents. Tiers for every age group are in what time you need for Boston 2028.

Verdict

If you are fit now and your legs dislike downhills, run Monumental. If you need more weeks of training or you have done real downhill work, run CIM. The full reviews are here: Indianapolis Monumental and CIM, and if you are also weighing a January race, see CIM vs Houston. Before race week, put your age, gender and goal time into the cutoff predictor to see how that buffer would have done against every real Boston cutoff since 2014.