Allow for the weather
It is a good idea to avoid high altitude routes on overcast days. Not only will risk missing out on the good views, but navigating can also be difficult in the mist, not to mention ensuring the route ahead is safe. Also, it is a good idea to avoid high altitude hiking when the weather is bad, even with waterproof clothing, the last thing that you want is to be stuck an hour or more from shelter or public transport if a storm comes in. You can always find a low altitude hike in the valleys that is close to shelter.
It is also a good idea to keep a regular eye on short term local weather forecasts, as the weather in the Alps can change really quickly. Be prepared to be flexible with your plans and have different options, possibly in different regions, available depending on the weather forecast on the day.
and the season
Whilst some of the low altitude pedestrian trails are open all year, the majority of the mountain and Alpine trails are not accessible in Winter. Winter can span from December to March, or from October to June, depending on the altitude and location of the trail.
If necessary, avoid trails covered with snow. Trails at high altitudes can be so covered, that hiking is nearly impossible, even in Summer. The local tourist agency or rail/gondola station can provide up to date information about trail conditions. But even when the trail is open, you may come across unexpected blocked paths due to left over snow. The picture to the right was taken on the ascent to Guscha in late May at an altitude of about 1800m
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