Question:

“If you perform ‘Umrah in the first night of Ramadhan, is that considered part of Ramadhan?

Al-‘Allâmah Sâlih al-Fawzân:

“[Whether] you perform ‘Umrah in Ramadhan during the day or night or at the start, middle or end, it’s [considered] an ‘Umrah in Ramadhan.”

Source: http://www.alfawzan.af.org.sa/node/14852