Silent Valley in March is the heat-stratified month. Daytime 24-32C in the valley, nights 20-22C, humidity climbing toward 70 percent in the last fortnight, rainfall under 30mm. The 4-hour Mukkali-Sairandhri escorted trail compresses to dawn departures — Forest Department issues morning permits with mandatory return by 11am-noon to clear mid-day heat. Lion-tailed Macaque (Macaca silenus, population 200-300, one of India's densest concentrations) encounters remain consistent, especially at the watchtower 1 viewpoint where troops feed in fig trees through the morning hours. Other primates and mammals all visible but the visit window collapses to the 4-hour escorted block versus year-best 5-6 hour February timing. Forest Department permit operations from the Mukkali range office continue at full tempo — advance permit lead 7-10 days (eased from 7-15 days February peak), ₹1,500-2,500 per group, mandatory armed guard escort. KFD log-house at Mukkali ₹1,800 with permit-bundle; Mukkali homestays ₹900-2,000; Anaikatti homestays ₹1,000-2,500. Hotel rates 30 percent below January. Holi long weekend brings a 3-day domestic bump. The 5-hour Kozhikode-Mannarkkad drive (110km via NH544 + NH213) at clearest visibility.

Why March scores 4.0/10