The Kaas Plateau (also known as Kaas Pathar) is a UNESCO World Heritage site, that goes into full bloom every September, and it’s a gorgeous, gorgeous site.
You'll get to see hundreds of varieties of wildflowers in full bloom and every colour you can imagine. More than 300 varieties of wildflowers, herbs, orchids, shrubs and insectivorous plants can be seen here. It's truly a sight for sore eyes!
In case you aren’t confident about making the journey by yourself, a lot of travel groups organise tours. Trek Mates India is one such tour that has three batches, all in September (overnight stay) that will cost you INR 2,000 per head.
Mumbai Pune Adventures, another trekking group, has also planned a 1 night 1 day trip to Kaas Valley, with multiple date options in the month of September. We suggest you book your tickets immediately. You can contact them on 9967564888 / 7039576756.