The Coast to Coast could be walked all year round, however navigation and conditions can be difficult in poor conditions. As such, it is best walked in the period of May to October. There are a couple of different possible itineraries and I have listed three: 12 days, 14 days and 15 days.
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The hardest section of the trail is in the Lake District, so if you're familiar with the challenge of Lake District territory, you'll be able to manage the physical challenges of the Coast to Coast. If you're fit, healthy and accustomed to multi-day walking, you'll be okay!