Generally, listening to music via earphones is allowed in most races.  I don’t advise listening to music via earphones during a race. The reasons include:

• Safety & awareness – it is more difficult to hear and be aware of runners around (beside, behind) you while listening to music. I’ve seen several accidents and injuries during races caused by unaware persons listening to music
• Connection with others around you – listening to music takes away your opportunity to interact with fellow runners during the race, and with volunteers and fans

Visit the Running in Heat section of AskRunGuy for tips on running in extreme temperatures, and how to prepare / dress for these situations.

Visit the Running in Cold section of AskRunGuy for tips on running in extreme temperatures, and how to prepare / dress for these situations.

Visit the Running in Heat  and the Running in Cold sections of AskRunGuy for tips on running in extreme temperatures, and how to prepare / dress for these situations.

Visit the Etiquette Tips for Runners section of AskRunGuy for some race and running etiquette guidelines.

Visit the Etiquette and Safety section of AskRunGuy for some tips on running at night, running alone, running in high traffic areas and running with dogs.