This week's easternmost sighting was in Elizabethton, TN, more than 1,000 miles northeast of San Antonio, Texas. In contrast, the monarchs have only advanced 500 miles northward if we measure to Ponca City, Oklahoma.

The orange arc on the map above shows where monarchs would be now if they had spread equally in all directions upon entering Texas. Had they flown directly northward, for example, they would be in South Dakota now!