If you want to see rhododendrons in the Himalayas, there is only one trek in India you should do in March and April – Ranthan Kharak Trek in Kumaon, Uttarakhand.
https://indiahikes.com/ranthan-kharak-trek#gref
Most trekkers think they’ve seen rhododendrons on famous trails like Goechala, Sandakphu Phalut, or Dayara Bugyal. But nothing prepares you for the density, scale, and colors of rhododendron forests on the Ranthan Kharak trail.
Within 90 minutes of starting from Namik Village, you enter a magical meadow at Raj Giddgiri Kharak surrounded by 360° rhododendron canopies in scarlet,…
source

