The best time for a visit would naturally depend upon what the visitor is specially interested in -summer would be best if one is keen on observing the larger mammals and winter if one'sinterest lies mainly in water birds.

As with the rest of the country, there are three well-defined seasons at the Corbett National Park-winter from November to February, summer from March to June and the rainy season the rest of the year. Corbett is closed for public from June 15 to November 15.
Visiting Season of Corbett National Park
The park is open from November, though the roads the motorable from December 15. From November to January the visibility is poor, due to the dense undergrowth, the weather is cold and only the Tigers and Crocodiles are to be seen. Towards the end of January the visibility starts improving and the Carnivora and Deer, along with the Crocodile. The weather is pleasant and the nights, cold.