Next spring might seem like a long way off but if you are planning of running a marathon then it makes sense to start planning your training now.

Although a lot of training plans may not start until December/January, I would really recommend starting some easy runs now in order to build up a base level of fitness. For complete beginners, this may mean bolting together small blocks of running and walking until you are able to continuously run for say 40-60 minutes by mid-December. Even if you are an experienced runner, it is always sensible to start your planning early and include other aspects like cross-training and strength work.