Survival, growth and yield responses of salt-tolerant rice varieties were evaluated under seawater irrigation at various growth stages. Four Salinas (salt-tolerant) varieties (Rc 182, RC 186, Rc334, and RC326), a farmer’s variety (Rc 10), and susceptible check (IR 29) were exposed to pure seawater with 50.97 dS/m EC and irrigated with 50 liters per 100 cm² for three consecutive days at vegetative (BBCH 21-beginning of tillering), reproductive (BBCH 51-beginning of panicle emergence), and ripening (BBCH 85-soft dough) stages. Treatments flooded with seawater at the reproductive stage (panicle initiation) was most severely affected, with a high number of dead leaves, a lower leaf area, and a fifty percent (50%) reduction in filled grains. Days to maturity was shortened by a week, and sodium accumulation in roots and straw was higher. Exposure to seawater at the vegetative stage delayed maturity by one week compared to control plants. Theh varieties Rc 182, Rc 186, Rc 334, and Rc 326 were found to be suitable in seawater intrusion areas if exposure can be limited at the vegetative and ripening stages. Planting dates, even for NSIC-approved salt- tolerant varieties, should be adjusted to avoid exposure to salinity stress during the critical reproductive stage.