It is perfectly safe in the Katmandu valley. If you want to go outside the valley, you should check with a local or guide who knows where is safe and where isn’t. This is a great time of year to go…check out Nagarkot, which is on top of the East mountains surrounding the valley. There are beatiful hotels up there with a perfect view of the himalayan range. In the summer they are covered by thick clouds, but this time of year it is crystal clear.