Karwa Chauth in the USA in 2025 is observed on Thursday, October 9, not October 10 as in India. The fasting time in the USA (specifically for New York) generally starts around 7:01 AM and ends at 7:42 PM, with the puja muhurat from 6:25 PM to 7:40 PM and the moonrise occurring at 7:42 PM local time.
In contrast, in India, Karwa Chauth falls on Friday, October 10, 2025, with the moonrise and fasting timings following Indian Standard Time.
So for the USA, Karwa Chauth 2025 is on October 9, Thursday.