Potato futures for May fell by Rs 21,40, or 2.05%, to Rs 1,020 per quintal in 95 lots.
At the Multi Commodity Exchange (MCX), the April contract traded lower by Rs 9.30, or 0.90%, to Rs 1,017.40 per quintal in 12 lots.
Prices fell as speculators offloaded their positions driven by weak trend in the spot market.
Besides, increased supplies in the spot market from producing regions further pulled down the prices.