diff --git a/channels/cmd/channels/main.go b/channels/cmd/channels/main.go
index c9c60c485d210..2a1f26680583e 100644
--- a/channels/cmd/channels/main.go
+++ b/channels/cmd/channels/main.go
@@ -18,6 +18,7 @@ package main
 
 import (
 	"context"
+	"flag"
 	"fmt"
 	"os"
 
@@ -35,6 +36,11 @@ func main() {
 
 func run(ctx context.Context) error {
 	klog.InitFlags(nil)
+	// Opt into the new klog behavior so that -stderrthreshold is honored even
+	// when -logtostderr=true (the default).
+	// Ref: kubernetes/klog#212, kubernetes/klog#432
+	flag.Set("legacy_stderr_threshold_behavior", "false") //nolint:errcheck
+	flag.Set("stderrthreshold", "INFO")                   //nolint:errcheck
 
 	f := cmd.NewChannelsFactory()
 
diff --git a/cmd/kops-controller/main.go b/cmd/kops-controller/main.go
index 853b26e23a817..9e51ec39e0de1 100644
--- a/cmd/kops-controller/main.go
+++ b/cmd/kops-controller/main.go
@@ -79,6 +79,11 @@ func main() {
 	ctx := context.Background()
 
 	klog.InitFlags(nil)
+	// Opt into the new klog behavior so that -stderrthreshold is honored even
+	// when -logtostderr=true (the default).
+	// Ref: kubernetes/klog#212, kubernetes/klog#432
+	flag.Set("legacy_stderr_threshold_behavior", "false") //nolint:errcheck
+	flag.Set("stderrthreshold", "INFO")                   //nolint:errcheck
 
 	// Disable metrics by default (avoid port conflicts, also risky because we are host network)
 	metricsAddress := ":0"
diff --git a/cmd/kops/root.go b/cmd/kops/root.go
index 7d95d3428da5e..c8268676f5c81 100644
--- a/cmd/kops/root.go
+++ b/cmd/kops/root.go
@@ -104,7 +104,9 @@ func init() {
 	cobra.OnInitialize(initConfig)
 
 	klog.InitFlags(nil)
-	// Opt into fixed stderrthreshold behavior (kubernetes/klog#212).
+	// Opt into the new klog behavior so that -stderrthreshold is honored even
+	// when -logtostderr=true (the default).
+	// Ref: kubernetes/klog#212, kubernetes/klog#432
 	_ = goflag.Set("legacy_stderr_threshold_behavior", "false")
 	_ = goflag.Set("stderrthreshold", "INFO")
 
diff --git a/cmd/kube-apiserver-healthcheck/main.go b/cmd/kube-apiserver-healthcheck/main.go
index 7d255fa3e1541..097b47c71dc65 100644
--- a/cmd/kube-apiserver-healthcheck/main.go
+++ b/cmd/kube-apiserver-healthcheck/main.go
@@ -140,6 +140,11 @@ func run() error {
 	flag.StringVar(&caCert, "ca-cert", caCert, "path to ca certificate")
 
 	klog.InitFlags(nil)
+	// Opt into the new klog behavior so that -stderrthreshold is honored even
+	// when -logtostderr=true (the default).
+	// Ref: kubernetes/klog#212, kubernetes/klog#432
+	flag.Set("legacy_stderr_threshold_behavior", "false") //nolint:errcheck
+	flag.Set("stderrthreshold", "INFO")                   //nolint:errcheck
 
 	flag.Parse()
 
diff --git a/cmd/nodeup/main.go b/cmd/nodeup/main.go
index 870612895633a..5c6735a9b2176 100644
--- a/cmd/nodeup/main.go
+++ b/cmd/nodeup/main.go
@@ -35,6 +35,11 @@ const (
 
 func main() {
 	klog.InitFlags(nil)
+	// Opt into the new klog behavior so that -stderrthreshold is honored even
+	// when -logtostderr=true (the default).
+	// Ref: kubernetes/klog#212, kubernetes/klog#432
+	flag.Set("legacy_stderr_threshold_behavior", "false") //nolint:errcheck
+	flag.Set("stderrthreshold", "INFO")                   //nolint:errcheck
 
 	var flagConf, flagCacheDir, gitVersion string
 	var flagRetries int
diff --git a/dns-controller/cmd/dns-controller/main.go b/dns-controller/cmd/dns-controller/main.go
index 9cd6f8e30f1f5..263d86308dcec 100644
--- a/dns-controller/cmd/dns-controller/main.go
+++ b/dns-controller/cmd/dns-controller/main.go
@@ -62,6 +62,11 @@ func main() {
 
 	// Be sure to get the glog flags
 	klog.InitFlags(nil)
+	// Opt into the new klog behavior so that -stderrthreshold is honored even
+	// when -logtostderr=true (the default).
+	// Ref: kubernetes/klog#212, kubernetes/klog#432
+	flag.Set("legacy_stderr_threshold_behavior", "false") //nolint:errcheck
+	flag.Set("stderrthreshold", "INFO")                   //nolint:errcheck
 	klog.Flush()
 
 	flag.StringVar(&dnsServer, "dns-server", "", "DNS Server")
diff --git a/protokube/cmd/protokube/main.go b/protokube/cmd/protokube/main.go
index b68c68ba9e70a..030bbd029ba1a 100644
--- a/protokube/cmd/protokube/main.go
+++ b/protokube/cmd/protokube/main.go
@@ -41,6 +41,11 @@ var (
 
 func main() {
 	klog.InitFlags(nil)
+	// Opt into the new klog behavior so that -stderrthreshold is honored even
+	// when -logtostderr=true (the default).
+	// Ref: kubernetes/klog#212, kubernetes/klog#432
+	flag.Set("legacy_stderr_threshold_behavior", "false") //nolint:errcheck
+	flag.Set("stderrthreshold", "INFO")                   //nolint:errcheck
 
 	fmt.Printf("protokube version %s\n", BuildVersion)
 
diff --git a/tests/e2e/kubetest2-kops/deployer/deployer.go b/tests/e2e/kubetest2-kops/deployer/deployer.go
index 6b0d7a7904916..3ef109af99b00 100644
--- a/tests/e2e/kubetest2-kops/deployer/deployer.go
+++ b/tests/e2e/kubetest2-kops/deployer/deployer.go
@@ -160,6 +160,11 @@ func New(opts types.Options) (types.Deployer, *pflag.FlagSet) {
 	// register flags for klog
 	klogFlags := flag.NewFlagSet("klog", flag.ExitOnError)
 	klog.InitFlags(klogFlags)
+	// Opt into the new klog behavior so that -stderrthreshold is honored even
+	// when -logtostderr=true (the default).
+	// Ref: kubernetes/klog#212, kubernetes/klog#432
+	_ = klogFlags.Set("legacy_stderr_threshold_behavior", "false")
+	_ = klogFlags.Set("stderrthreshold", "INFO")
 	fs.AddGoFlagSet(klogFlags)
 
 	return d, fs
diff --git a/tools/otel/traceserver/main.go b/tools/otel/traceserver/main.go
index 48f2adc00fa9b..6492327a2e7ce 100644
--- a/tools/otel/traceserver/main.go
+++ b/tools/otel/traceserver/main.go
@@ -60,6 +60,11 @@ func run(ctx context.Context) error {
 	flag.StringVar(&listen, "listen", listen, "endpoint on which to serve grpc")
 	flag.StringVar(&run, "run", run, "visualization program to run [jaeger, docker-jaeger]")
 	klog.InitFlags(nil)
+	// Opt into the new klog behavior so that -stderrthreshold is honored even
+	// when -logtostderr=true (the default).
+	// Ref: kubernetes/klog#212, kubernetes/klog#432
+	flag.Set("legacy_stderr_threshold_behavior", "false") //nolint:errcheck
+	flag.Set("stderrthreshold", "INFO")                   //nolint:errcheck
 	flag.Parse()
 
 	if src == "" {
diff --git a/upup/tools/generators/fitask/main.go b/upup/tools/generators/fitask/main.go
index 2428dec9e067b..cdc7a60c2a47c 100644
--- a/upup/tools/generators/fitask/main.go
+++ b/upup/tools/generators/fitask/main.go
@@ -17,6 +17,7 @@ limitations under the License.
 package main
 
 import (
+	"flag"
 	"os"
 
 	"k8s.io/gengo/args"
@@ -25,6 +26,11 @@ import (
 
 func main() {
 	klog.InitFlags(nil)
+	// Opt into the new klog behavior so that -stderrthreshold is honored even
+	// when -logtostderr=true (the default).
+	// Ref: kubernetes/klog#212, kubernetes/klog#432
+	flag.Set("legacy_stderr_threshold_behavior", "false") //nolint:errcheck
+	flag.Set("stderrthreshold", "INFO")                   //nolint:errcheck
 	arguments := args.Default()
 	if err := arguments.Execute(
 		NameSystems(),