One of the critical factors for agricultural cultivation in tidal swamp land is cropping time. Paddy cropping time has a very important role in the final production of agricultural cultivation. Currently, thre is 3 cropping time in Indonesia, in the rainy season (November to February), first of dry season (March to June), and second of dry season, (July to October). However, the climate change dynamic such as drought (El Nino) and wetness (La Nina), shifting the cropping time and resulting a negative impact on the productivity of paddy rice. Therefore, an analysis of the rice cropping time needs to be done on Kalimantan tidal swampland area. Cropping time in the tidal swampland area began after the amount of rain was sufficient to dissolve the levels of iron in water. In West Kalimantan, the cropping time realization generally occurs in Dasarian 28 (October), while East Kalimantan on Dasarian 31 (November), and South Kalimantan and Central Kalimantan on Dasarian 7 (March). Cropping time in tidal swamp land showed a high level of substantiality to climate change, in which planting time did not change for 10 years in different climatic conditions. Keywords: decadal, tidal, rainwater, substantiality