<![CDATA[Pasuruan Regency, with 213,686 farmers and a population growth rate of 0.4–1% annually, faces an urgent need for a stable food supply due to fluctuating potato prices and stock levels linked to unplanned planting. This study aims to identify optimal potato planting patterns and schedules using the Thornthwaite-Mather water balance method, based on monthly rainfall data. The Oldeman climate classification revealed five climate types in Pasuruan: C2, D2, D3, D4, and E, influenced by monsoon patterns affecting soil water availability. Soil moisture levels are suitable for potato planting from January to March, decrease from May to October, and increase again in November. The western region (Pasuruan city) tends to be drier, with a longer dry season. The resulting planting schedule recommendations are as follows: climate type C2 (first planting season: November–February; second planting season: March–June), D2 (first planting season: December–March), D3 (first planting season: January–April), and D4 and E (first planting season: February–May), to support the stability of potato production and food security in Pasuruan on a sustainable basis.]]>
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