diff --git a/pkg/storage/bench_data_test.go b/pkg/storage/bench_data_test.go
index 4f8c02a6de85..e91e4f2a4ad5 100644
--- a/pkg/storage/bench_data_test.go
+++ b/pkg/storage/bench_data_test.go
@@ -23,6 +23,7 @@ import (
 	"github.com/cockroachdb/cockroach/pkg/util/encoding"
 	"github.com/cockroachdb/cockroach/pkg/util/hlc"
 	"github.com/cockroachdb/cockroach/pkg/util/log"
+	"github.com/cockroachdb/cockroach/pkg/util/metamorphic"
 	"github.com/cockroachdb/cockroach/pkg/util/randutil"
 	"github.com/cockroachdb/pebble/vfs"
 	"github.com/stretchr/testify/require"
@@ -69,9 +70,23 @@ func getInitialStateEngine(
 	ctx context.Context, b *testing.B, initial initialState, inMemory bool,
 ) Engine {
 	name := strings.Join(initial.Key(), "-")
-	dir := testfixtures.ReuseOrGenerate(b, name, func(dir string) {
+
+	// In CI, we sometimes run benchmarks in metamorphic builds to ensure the
+	// benchmarks pass. We don't want to cache the fixtures generated by these
+	// runs, because we may end up caching fixtures that reflect metamorphic
+	// values. This can lead to very non-deterministic behavior in the
+	// benchmarks depending on what metamorphic settings were active when the
+	// fixture was generated.
+	var dir string
+	if metamorphic.IsMetamorphicBuild() {
+		b.Log("running in metamorphic build; ignoring existing fixtures and not caching new ones")
+		dir = b.TempDir()
 		buildInitialState(ctx, b, initial, dir)
-	})
+	} else {
+		dir = testfixtures.ReuseOrGenerate(b, name, func(dir string) {
+			buildInitialState(ctx, b, initial, dir)
+		})
+	}
 	dataDir := filepath.Join(dir, "data")
 
 	opts := append([]ConfigOption{