These numbers for the strata at Arad were assigned by Yohanan Aharoni. The lowest number represents the highest level, which was the last to be occupied but the first to be uncovered.

Stratum I cemetery 10th–16th centuries A.D.
Stratum II caravanserai 7th–9th centuries A.D.
Stratum III Roman fort 1st century A.D.
Stratum IV Hellenistic tower and fort 3rd–2nd centuries B.C.
Stratum V Persian 4th century B.C.
Stratum VI Israelite early 6th century B.C.
Stratum VII Israelite late 7th century B.C.
Stratum VIII Israelite late 8th century B.C.
Stratum IX Israelite early 8th century B.C.
Stratum X Israelite 9th century B.C.
Stratum XI Israelite 10th century B.C.
Stratum XII Kenite early 12th century B.C.