Can time-locked commitment-saving (TLCS) ahead of lean season alter consumption downfalls among the ultra-poor? We collected 36 rounds of bi-weekly household panel data over two-years and conducted a savings experiment in the second year by randomly allocating TLCS accounts to households with either temporary savings subsidy (T1) or prevailing market interest rate (T2). T1 group doubles the formal savings, resulted in higher protein intake and increased food and non-food expenditure by 8.6-12.6% during the lean season. T2 group shows no discernable impacts. These results suggest TLCS with subsidy reward for encouraging savings could be a viable tool tackling seasonal hunger.