At their best in April
The months each trek's sources call the best.

Prashar Lakeपराशर झील
Himachal · Mandi

David Scott TrailDavid Scott
Northeast · East Khasi Hills

Kheergangaखीरगंगा
Himachal · Kullu

Dzükou ValleyDzükou
Northeast · Kohima

Doditalडोडीताल
Uttarakhand · Uttarkashi

Gaumukh Tapovanगौमुख–तपोवन
Uttarakhand · Uttarkashi

Pindari Glacierपिंडारी ग्लेशियर
Uttarakhand · Bageshwar

Dzongriज़ोंगरी
Sikkim & Darjeeling · West Sikkim

Green Lakeग्रीन लेक
Sikkim & Darjeeling · Mangan

Pangarchullaपंगरचुल्ला
Uttarakhand · Chamoli

Goechalaगोएचा ला
Sikkim & Darjeeling · West Sikkim

Bailey Trail (Tawang)Bailey Trail
Northeast · West Kameng–Tawang

Chopta Chandrashilaचंद्रशिला
Uttarakhand · Rudraprayag

Sandakphuसन्दकफू
Sikkim & Darjeeling · Darjeeling
Also possible in April
Doable, but not the peak season: expect snow, rain or heat, as each trek page explains.

Harishchandragadहरिश्चंद्रगड
Western Ghats · Ahilyanagar

Dayara Bugyalदयारा बुग्याल
Uttarakhand · Uttarkashi

Har Ki Dunहर की दून
Uttarakhand · Uttarkashi

Tadiandamolತಡಿಯಾಂಡಮೋಳ್
Western Ghats · Kodagu

Madmaheshwarमदमहेश्वर
Uttarakhand · Rudraprayag

Kedarkanthaकेदारकांठा
Uttarakhand · Uttarkashi

Kedartalकेदारताल
Uttarakhand · Uttarkashi