Eupithecia swettii is a moth in the family Geometridae first described by John Arthur Grossbeck in 1907. It is found in eastern North America, from Quebec and Massachusetts to North Carolina in the south-east and through Missouri and Kansas to Mississippi. It is also found in eastern Texas.[1]
The length of the forewings is 8.5–10.5 mm. Adults are on wing from January to April in the south and to May and even July in the north.