CIM Course Guide

CIM is one of the most respected BQ courses in the country. It drops a net of about 366 feet from Folsom to the State Capitol in Sacramento, enough to help, not enough to trigger a downhill penalty: CIM sits within the Boston Marathon Index standards with no adjustment applied, unlike the steeper Revel-type courses (Revel Big Bear, and to a lesser degree St. George), which get a time penalty added under the Boston Athletic Association's 2027 downhill-course rule. Combine that clean net downhill with cool December weather, extensive official pace teams, and a course built for even effort, and you get a marathon that consistently produces strong BQ and PR rates.

CIM is not flat, it is a rolling downhill, and that distinction matters. The overall net drop of about 366 feet comes with gentle rollers along the way, especially in the first half, rather than one smooth decline. That rolling profile rewards runners who hold an even, controlled effort and can punish anyone who tries to bank time on the early downhill sections without respecting the small climbs mixed in.

Run the rolling first half by effort, not by chasing the net-downhill number on your watch. The gentle rollers mean your pace will naturally vary a little mile to mile even at even effort, and that is normal on this course. Because CIM is one of the most pace-team-supported marathons in the country, joining an official pace group for your goal time is a legitimate strategy here, more so than at hillier or more crowded majors, since the course is built for exactly that kind of disciplined, even-effort running.

Early December in the Sacramento Valley is usually cool and good for racing: start temperatures commonly sit in the high-30s to mid-40s Fahrenheit, with occasional fog or light rain and sometimes wind. Most years produce solid PR conditions, which is part of why CIM draws such a strong BQ-focused field. Check the forecast in race week, since fog can affect visibility at the point-to-point start even when it does not affect temperature much.

CIM uses open, first-come registration with no lottery, but it sells out well ahead of race day given its reputation as a premier BQ and Olympic Trials qualifier race. If you are planning to run it, register as early in the year as you can rather than waiting, since waiting is the main way runners miss out on this one.

The official course limit is 6 hours, roughly a 13:44 per mile pace, and aid stations and course support close on that schedule. It is a generous window for a course this well regarded for fast times, so back-of-pack and BQ-chasing runners alike have real support throughout.