/ Nepal in January 2018
With that time frame you won't be able to acclimatise much, but you could do a short trek and maybe climb a 5000+m hill.
Langtang valley is probably the best bet, as you can be up high in the valley a few days out of KTM and maybe trek up Tsergo Ri and nearby hills, snow permitting. There are also waterfalls that freeze on the southern side of the valley (facing north) and some have been climbed. You'd need to check it had been cold enough before lugging technical gear up there though. Since the 2015 earthquake devastated the villages, they have been rebuilt, and also the track has been re-done. For a year or so there was a new track on the other side of the valley, with fewer lodges, but I believe now (when I checked in KTM in Nov) that the old route is mostly restored.
You can also get high into the Manang valley (north side of Annapurna massif) now in two days from Pokhara, via bus and jeep, so that is also an option. If there wasn't much snow you could even do the Circuit, over the Thorung La to Jomsom and fly or bus back to Pokhara. There's probably less of a chance to top out on a small hill in Manang, but there are more lodges and bigger scenery.
I did the Annapurna Circuit in November - if you're feeling fit, travel light and don't have any problems with the altitude, you can bang it out in under 2 weeks, depending on how much you walk/get a jeep. We did Besisahar to Beni in 8 days on mountain bikes with 1 guy running it.
You'll need to get permits to go into the Annapurna Conservation Area - cheaper in Besisahar than the first checkpoint.
Takes about a day to bus from KTM to Besisahar, 1/2 day from Beni to Pokhara and another day back to KTM, or you could fly from Jomsom as Damo said.
Thanks both. I did the Annapurna Circuit a few years ago and was planning on doing it again later in the season (I'm there for a while).
I might take a look at the Lantang Valley.
Going in April without heaps of time - we've decided on the Khorpa Danda/Khopra Ridge trek. Think it's about 6/7 days in total, might be worth a look if you're short on time.
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