Uganda treks year-round — gorillas and chimpanzees do not migrate, so there is no single 'best' month the way there is for the Serengeti. What changes is trail conditions and price. June-to-September and December-to-February are the two dry windows: firmer, less slippery forest trails in Bwindi and Kibale, and the classic time to combine trekking with game drives in Queen Elizabeth or Murchison Falls National Parks. March-May and October-November are wetter — trails turn genuinely muddy and trekking becomes a harder, slower, more physical day — but permits are easier to secure on short notice and UWA's discounted low-season permit pricing (currently $600 rather than $800 for foreign non-residents in April, May and November specifically) makes this the savvy-traveler window if you are reasonably fit and do not mind mud. Birding is arguably at its best during the wetter months, when migrant species are present alongside residents. Our honest guidance: book the dry season if this is a once-only trip and comfort matters; consider the discounted shoulder months if budget flexibility outweighs trail conditions for you.