Ask any local runner what is the most challenging 10K is in Charleston and the answer might surprise you.

It’s usually not the Cooper River Bridge Run, but rather the often windier, “hillier” James Island Connector Run, the 15th of which will be held at 8:30 a.m. Saturday.

The connector run, not to be confused with the one on the Isle of Palms a month earlier, also has a 5K, but I’ve never understood why someone would run a 5K when a more rare 10K is available.

The Gavalas Kolanko Foundation, which puts on the James Island Connector Run, has taken steps in recent years to improve its race, namely by moving the post-race event to Cannon Park and putting a little more distance between the start and the first and steepest climb.

The cost is $35. Proceeds from its race to fund scholarships for disabled college students at local universities. In-person registration and packet pick-up will be 2-7 p.m. Friday and starting at 6:30 a.m. Saturday at Cannon Park.

Checks and debit/credit cards will be accepted.

http://jicrun.com/index.htm

Night-time runs

Even before Daylight Saving Time ends Sunday, two runs are celebrating the dark days ahead by holding night-time runs, in the woods.

The first, Carrera de los Muertos (Race of the Dead), will be 7-9 p.m. Friday on Mexico’s Day of the Dead. The six-mile run on Swamp Fox Passage in the Francis Marion National Forest starts and ends at the campground on Halfway Creek Road.

The run is free, but you better bring a head lamp.

www.facebook.com/events/373692499377158

The second is the latest installment of a “glow run,” night-time runs that typically feature glow sticks and disco-like lighting.

The Cosmic Glow Run will be 8 p.m. Saturday at Middleton Place. The Facebook page describes the noncompetitive event as follows:

“Run, walk, or dance your way thru as you get showered with florescent powder and become a luminescent work of art! Specialty lighting and different genres of music will be present throughout the course.”

The event cost $50 and some proceeds go to LEARN Horse Rescue.

www.cosmicglowruncharlestonsc.com

Charity 5Ks

Among the charity 5Ks this weekend are the Run to Combat Childhood Obesity and the NephCure 5K to fight kidney disease.

The Run to Combat Childhood Obesity 5K will be at 8:30 a.m. Saturday at Palmetto Island County Park in Mount Pleasant. Kids runs start at 10 a.m. Cost for adults is $25. A free post-race family fit festival also will be help.

http://generationhealthykids.org

The NephCure 5K will be 9 a.m Sunday at Wescott Plantation’s golf club in Summerville. Fees range from $35 for adults who want a pancake breakfast to $10 for children to run the race.

www.nephcure.org/walk

Reach David Quick at dquick@postandcourier.com or 937-5516.