diff --git a/app/appengine/ui.go b/app/appengine/ui.go
index c0207df..9aa8a50 100644
--- a/app/appengine/ui.go
+++ b/app/appengine/ui.go
@@ -140,6 +140,25 @@
 				tagState = append(tagState, s)
 			}
 		}
+		// Sort tagState in reverse lexical order by name so higher
+		// numbered release branches show first for subrepos
+		// https://build.golang.org/ after master. We want the subrepo
+		// order to be "master, release-branch.go1.12,
+		// release-branch.go1.11" so they're in order by date (newest
+		// first). If we weren't already at two digit minor versions we'd
+		// need to parse the branch name, but we can be lazy now
+		// and just do a string compare.
+		sort.Slice(tagState, func(i, j int) bool { // is item 'i' less than item 'j'?
+			ni, nj := tagState[i].Name, tagState[j].Name
+			switch {
+			case ni == "master":
+				return true // an i of "master" is always first
+			case nj == "master":
+				return false // if i wasn't "master", it can't be less than j's "master"
+			default:
+				return ni > nj // "release-branch.go1.12" > "release-branch.go1.11", so 1.12 sorts earlier
+			}
+		})
 
 	BuildData:
 		p := &Pagination{}