As mentioned in
this article, the best time for trekking in Kyrgyzstan is during the summer (from mid-June to early September). If you plan to embark on a trek during this season, it's advisable to book your tour well in advance.
Despite being a mountainous country, Kyrgyzstan has a limited number of locals working in the trekking industry — good mountain guides and porters are in short supply. Closer to mid-June, many guides are already booked, and situations arise where tourists request tours for August in July, finding that many companies have no availability due to being sold out.