8. Setting The Dates: The end of June gives the longest daylight hours, and the shortest periods of darkness. It is possible to organise your challenge so that you do not have to walk any mountain in the dark at this time. However, this is also by far the busiest time of year for the challenge, and you certainly won't be alone. Check the internet for dates of large organised events, and try to avoid these dates. If possible, use mid-week or a staggered weekend (ie, Fri/Sat or Sun/Mon) rather than the weekend itself. For dates either side of the summer (April, October) you may well find that you have to walk two mountains in the dark.