There are several reasons to turn back, such as:

• Weather changes. When the weather changes suddenly, you need to respect nature’s unpredictability and head for home.
• Fatigue. Your group's pace should be set by the slowest hiker. If that hiker is unable to continue, keep your group together.
• Unexpected conditions, like streams that are too swollen by rain or snowmelt to cross.
• Running out of time. Darkness can come quicker than expected.

Respect the messages and signals nature and your body send. If you stay safe, you can always come back another day.

Above all else, you should never change your route. If you do not return on schedule and the person you left your plans with contacts authorities, search and rescue efforts will start where it is presumed you are. If you have taken another route, this can substantially delay help reaching you. Always leave emergency plans with someone reliable and responsible.