The most important thing to understand about pacing the Carmel Marathon is that it's two different races stitched together at mile 13. The first half, which you run with the entire half marathon field, is faster, more crowded, and gently downhill. The second half, which you run with only the marathon field, is quieter, slightly uphill in the middle, and psychologically lonelier. If you pace both halves the same way, you'll run a great first half and a painful second half. That is the single most common mistake at this race.
Miles 1 to 6: Goal pace + 5 to 10 seconds. The gentle downhill trend on Westfield Boulevard and the energy of the combined marathon/half field will make goal pace feel effortless. That's the trap. Let the pace come to you rather than chasing it. If your goal is 3:30 (8:01/mile), run 8:08 to 8:12 through these miles. You are investing in miles 16 through 22.
Miles 6 to 13: Goal pace. The terrain begins to roll gently. The turns through neighborhoods break up the straightaways. You're still with the half marathon runners, which keeps the energy high and the pacing easier. Find your rhythm and lock in.
Mile 13: The mental transition. The half marathon runners finish. The field around you drops by more than half. The crowd thins. The course changes to a different loop. This is where many runners feel a sudden sense of isolation, even on a course with 1,500 people. If you're running with a pace group, this is where the pacer earns their value. Stay with them.
Miles 13 to 16: Goal pace. The early second half includes some shaded trail sections that are pleasant and relatively flat. This is a good stretch to eat, drink, and settle into the new reality of running without the half field.
Miles 16 to 22: Goal pace, by effort not by watch. This is where the race is won or lost. The course has a persistent, gentle uphill trend through this section. No single hill is notable, but the cumulative effect on fatigued legs is real. Multiple runners have described this stretch as a "constant climb that goes on forever." If your watch says you've slowed by 10 to 15 seconds per mile and you're running by effort, you're probably doing it right. Don't fight the terrain. Don't panic about the pace.
Miles 22 to 26.2: Goal pace - 5 to 10 seconds. The course returns to the downtown area and trends flat to slightly downhill. If you were disciplined through the middle, this is where you cash in. The last two miles are through the Arts and Design District, and the crowd noise builds as you approach the Palladium. Finish strong.
The math. On a 3:30 goal (8:01 average), this strategy produces a first half around 1:45:30 to 1:46:00 and a second half around 1:44:00 to 1:44:30. That's a slight negative split, which on this course is the hallmark of a perfectly executed race. Most BQ finishers at Carmel run slight negative splits. Most blown-up races are massive positive splits caused by an undisciplined first 6 miles.
One note on pace groups. Carmel offers pacers running BQ-specific times. If you're within 2 to 3 minutes of your BQ standard, running behind the appropriate pace group is the single best tactical decision you can make. On a flat course, pacing yourself is possible but harder than it sounds. Handing that job to someone else frees you to focus on running.