diff --git a/dashboard/builders.go b/dashboard/builders.go
index a31b96e3..4e41caec 100644
--- a/dashboard/builders.go
+++ b/dashboard/builders.go
@@ -2244,8 +2244,9 @@ func init() {
 			// of Go, hence the atLeastGo1 call below; versions of Go
 			// prior to 1.20 will use the *-oldcc variant instead. See
 			// issue 35006 for more details.
+			// Go 1.20 is also the last version with Windows 8/8.1 support. See proposal 57004.
 			return onlyGo(repo, branch, goBranch) &&
-				atLeastGo1(goBranch, 20)
+				atLeastGo1(goBranch, 20) && atMostGo1(goBranch, 20)
 		},
 		env: []string{"GOARCH=386", "GOHOSTARCH=386"},
 		tryBot: func(repo, branch, goBranch string) bool {
@@ -2348,8 +2349,9 @@ func init() {
 			// of Go, hence the atLeastGo1 call below; versions of Go
 			// prior to 1.20 will use the *-oldcc variant instead. See
 			// issue 35006 for more details.
+			// Go 1.20 is also the last version with Windows 8/8.1 support. See proposal 57004.
 			return onlyGo(repo, branch, goBranch) &&
-				atLeastGo1(goBranch, 20)
+				atLeastGo1(goBranch, 20) && atMostGo1(goBranch, 20)
 		},
 		env: []string{
 			"GOARCH=amd64",
diff --git a/dashboard/builders_test.go b/dashboard/builders_test.go
index 420ab362..07434681 100644
--- a/dashboard/builders_test.go
+++ b/dashboard/builders_test.go
@@ -101,7 +101,6 @@ func TestTrybots(t *testing.T) {
 				"linux-amd64-race",
 				"linux-arm64",
 				"openbsd-amd64-72",
-				"windows-386-2012",
 				"windows-386-2016",
 				"windows-amd64-2016",
 
@@ -152,7 +151,6 @@ func TestTrybots(t *testing.T) {
 				"linux-amd64-race",
 				"linux-arm64",
 				"openbsd-amd64-72",
-				"windows-386-2012",
 				"windows-386-2016",
 				"windows-amd64-2016",