Narrative:

Departing ZZZ we rejected takeoff due to possible traffic conflict. Speed was about 100 knots. As we were taxiing with ground control to and approaching the end of runway xx; a very short taxi. Ground control come onto the radio and closed the tower. The tower didn't advise us of any other traffic. I saw the one airplane taxiing to parking on foxtrot and a helicopter about 4 miles south of the field westbound; that was the only aircraft on TCAS. My first officer got our release from ZZZ center and we already had our departure clearance. My first officer made two announcements on communication one. One for about to taxi onto the runway for takeoff; and then just before starting the takeoff roll. At about 80 knots we heard on the radio something about runway xx. We were both still monitoring com two with ground. Something didn't feel right and I rejected the take off and stopped the aircraft before crossing runway xy. As we were slowing down I could see an aircraft [aircraft Y] on runway xy that was also stopped. Aircraft Y was not visible from the start of the takeoff roll due to terrain between the runways. Neither aircraft crossed the other aircraft's runway. At this time I looked down and noticed that [the first officer] had accidentally put in the wrong CTAF frequency and a 5 was replaced with an 8. After taxiing back to runway xx and complying with procedures for maintenance and btms of 4s and 3s. The flight departed and was normal.ATC not giving us all traffic on the field. First officer accidentally putting in the wrong CTAF frequency. I didn't verify the correct frequency.ATC should call out all traffic on the field. Verify everything especially the normal routine things.

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Original NASA ASRS Text

Title: Air carrier flight crew reported aborting a takeoff due to another aircraft taking off from an intersecting runway.

Narrative: Departing ZZZ we rejected takeoff due to possible traffic conflict. Speed was about 100 knots. As we were taxiing with ground control to and approaching the end of Runway XX; a very short taxi. Ground control come onto the radio and closed the tower. The tower didn't advise us of any other traffic. I saw the one airplane taxiing to parking on foxtrot and a helicopter about 4 miles south of the field westbound; that was the only aircraft on TCAS. My FO got our release from ZZZ center and we already had our departure clearance. My FO made two announcements on COM one. One for about to taxi onto the runway for takeoff; and then just before starting the takeoff roll. At about 80 knots we heard on the radio something about Runway XX. We were both still monitoring com two with ground. Something didn't feel right and I rejected the take off and stopped the aircraft before crossing Runway XY. As we were slowing down I could see an aircraft [Aircraft Y] on runway XY that was also stopped. Aircraft Y was not visible from the start of the takeoff roll due to terrain between the runways. Neither aircraft crossed the other aircraft's runway. At this time I looked down and noticed that [the FO] had accidentally put in the wrong CTAF frequency and a 5 was replaced with an 8. After taxiing back to Runway XX and complying with Procedures for maintenance and BTMS of 4s and 3s. The flight departed and was normal.ATC not giving us all traffic on the field. FO accidentally putting in the wrong CTAF frequency. I didn't verify the correct frequency.ATC should call out all traffic on the field. Verify everything especially the normal routine things.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.