Solah Somvar Vrat is a 16-consecutive-Monday fast dedicated to Lord Shiva, most commonly started on the first Monday of Shravan, though it can begin on any Shukla Paksha Monday. This blog covers the verified 2026 Shravan dates for North and South India, the two foundational legends behind the vrat (Goddess Parvati's own fast, and the priest cured of his curse), the exact dietary and conduct rules, the weekly puja vidhi, and why the Udyapan on the 17th Monday is considered essential, not optional, to completing the vrat correctly.