Event Alert System

A color-coded Event Alert System (EAS) will communicate the status of course conditions to participants leading up to and on race day. The levels range from Low (green) to Moderate (yellow) to High (red) to Extreme (black) based primarily on the weather, as well as other conditions.

• E-mail and Web site communication during race week will inform participants of the current Event Alert System status and provide preparation tips based on advance weather forecasts.
• Updates will be made at the Chicago Marathon Health & Fitness Expo via handouts at the Participant Packet Pick-Up area and public address announcements.
• On race day, the current Event Alert System status will be communicated via public address announcements and color-coded signs/flags at the start and finish areas, and along the course at each of the 20 Aid Station locations and via large digital traffic message boards.

All participants should familiarize themselves with the Event Alert System prior to the race, remain alert for directions from race officials and announcers and take precautions to prepare properly for varying weather conditions on race day.

Event Alert System table: