The race starts near the State Farm Center on First Street, the premier indoor arena on the U of I campus, home to Illini basketball. The campus is wide and flat and the crowd at the start is the largest it will be until the stadium. Free parking, free bagels and coffee at the start, and corrals that are genuinely well-managed for a non-major.

15% shade on the open campus roads, partial S wind through the building corridors. The first mile and a half run essentially flat. Add 8 seconds per mile and resist the morning energy. Campustown is ahead and it is louder than this.

Aid stations approximately every 1.5 miles throughout, with 17 hydration stations total

Green Street. The commercial and entertainment district directly south of campus. Students out on the sidewalks several rows deep. Live music at points. The noise on this stretch is the loudest crowd support on the course and it arrives less than three miles in, when the legs are fresh and the adrenaline is still full.

Add 8 seconds per mile through here and mean it every time the noise tells you not to. One runner's review says the same thing in different words: "My strategy was to run with the 3:50 pacer... I really needed to start slower and more conservatively so I would have energy at the end." That strategy is right. Campustown is where that decision gets made for most runners.

A 43-foot climb at mile 6.31 and a 21-foot punch at mile 5.49 punch through the neighborhood transition. Add another 8-10 seconds per mile. The Urbana residential miles are the reset.

The course moves into the quieter southeast Champaign residential grid: tree-lined avenues, modest homes, the crowd thinned to front-porch warmth. 30% shade and partial S wind protection from the neighborhood canopy. Nothing dramatic happens here.

Run at goal pace and let the legs settle from whatever Campustown did to them. A 31-foot climb arrives at mile 8.9, the most grade you've seen since the Green Street section. Short and manageable. The Urbana loop follows.

North Urbana's wide residential streets carry 40% canopy, some of the better shade between Campustown and the finish. Homeowners out on front porches, local energy, the kind of crowd that is small enough to make individual cheers meaningful. Meadowbrook Park and Crystal Lake Park anchor the Urbana character: native prairie plantings, quiet recreation areas, old residential neighborhoods that know the race is coming.

Find your rhythm and run at goal pace. Miles 11 through 14, through downtown Urbana, are the cleanest flat section of the second half.

The halfway point arrives in downtown Urbana, near Lincoln Square and the Urbana Market at the Square, a weekly farmers market that has been a gathering point for this community for decades. The crowd picks back up with a festive, neighborhood-scale energy.

Use the halfway point as information. Check your split. If you've been running goal pace through here after going out conservatively through Campustown, you are in position. If not, this is the moment to correct before the west Urbana climb makes correction significantly harder.

Miles 12 to 14 carry the flattest terrain of the second half, rolling gently between minor grade changes, sheltered from SW wind, 20% shade.

The course's hardest sustained grade arrives at mile 17.6 and doesn't let go until mile 18.3. 57 feet at 1.5% average grade, the steepest pitch on a course that has otherwise given you almost nothing to contend with. It arrives after 17 flat miles on legs that have not been asked for this, with 15% shade and SW wind exposure in western Urbana's open subdivision corridors.

This is the defining section of the back half. Budget 10-12 seconds per mile over goal pace through the full miles 14 to 18 block. Don't try to race the climb. Get over it with something left. The Research Park and the long north Champaign return are on the other side, and they are not forgiving.

Grade note: "a little steep elevation you do twice" is a recurring runner observation. The mile 18.77 climb (26 feet, 1.1%) and the 17.6 climb are both here in this block.

The course flattens through the Research Park and southwest campus corridor. The Research Park is a legitimate innovation hub, startups, major tech companies, university spinouts, but at 7:30 on a Saturday morning in late April, what it offers the runner is wide, flat, mostly empty road with 15% shade and a SW headwind off open terrain.

This is the mental desert of the Illinois Marathon. Miles 18 through 21 have the sparsest crowd and the most exposure of any section after Campustown. Physically it is manageable, the terrain is flat, the grade minimal. Mentally it is the place where the race asks for what you saved in the first half. Run 5 seconds per mile faster than goal pace if you have it. The north Champaign return follows, the campus comes back, and the stadium is visible on the other side.

University Avenue northbound. The course turns back toward campus and the gradual psychological lift of heading toward the finish begins. Scattered spectators appear. Local running clubs show up at points. A mild upward drift builds from mile 22 to mile 24. 24 feet at 0.3% grade, that won't feel meaningful until it does at mile 23.

Carry effort rather than checking pace. The stadium is close. A 12-foot statue of Red Grange stands on the west side outside the tunnels. 200 columns line the facade, 183 of them bearing a name. The crowd at the stadium approach builds to the loudest it has been since Green Street.

The stadium was built in 1923 as a memorial to the 183 University of Illinois students who died in World War I. Their names are on the columns. It was dedicated on October 18, 1924, when Red Grange, 21 years old, scored four touchdowns in the first 12 minutes of the dedication game and six by the final whistle, in a 39-14 demolition of a Michigan team that had not lost in 20 games. The Chicago Tribune called it: "one of the greatest performances in football history."

You run through the tunnel onto Zuppke Field and finish on the 50-yard line. The crowd in the stands is visible when the tunnel opens. Your image appears on the big screen. The race ends here, on this field, in a stadium that has been standing since the year that George Gershwin wrote Rhapsody in Blue.