diff --git a/.chloggen/remove_stable_featuregate.yaml b/.chloggen/remove_stable_featuregate.yaml
new file mode 100644
index 0000000000000..22b8ff10b1ba3
--- /dev/null
+++ b/.chloggen/remove_stable_featuregate.yaml
@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: breaking
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: k8sattributesprocessor
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Remove stable feature gate `k8sattr.rfc3339`
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [38810]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []
diff --git a/processor/k8sattributesprocessor/internal/kube/client.go b/processor/k8sattributesprocessor/internal/kube/client.go
index fffa10d5f985e..7697a48895117 100644
--- a/processor/k8sattributesprocessor/internal/kube/client.go
+++ b/processor/k8sattributesprocessor/internal/kube/client.go
@@ -13,7 +13,6 @@ import (
 	"time"
 
 	"go.opentelemetry.io/collector/component"
-	"go.opentelemetry.io/collector/featuregate"
 	conventions "go.opentelemetry.io/collector/semconv/v1.6.1"
 	"go.uber.org/zap"
 	apps_v1 "k8s.io/api/apps/v1"
@@ -30,14 +29,6 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector-contrib/processor/k8sattributesprocessor/internal/metadata"
 )
 
-var enableRFC3339Timestamp = featuregate.GlobalRegistry().MustRegister(
-	"k8sattr.rfc3339",
-	featuregate.StageStable,
-	featuregate.WithRegisterDescription("When enabled, uses RFC3339 format for k8s.pod.start_time value"),
-	featuregate.WithRegisterFromVersion("v0.82.0"),
-	featuregate.WithRegisterToVersion("v0.102.0"),
-)
-
 // WatchClient is the main interface provided by this package to a kubernetes cluster.
 type WatchClient struct {
 	m                      sync.RWMutex
@@ -478,14 +469,10 @@ func (c *WatchClient) extractPodAttributes(pod *api_v1.Pod) map[string]string {
 	if c.Rules.StartTime {
 		ts := pod.GetCreationTimestamp()
 		if !ts.IsZero() {
-			if enableRFC3339Timestamp.IsEnabled() {
-				if rfc3339ts, err := ts.MarshalText(); err != nil {
-					c.logger.Error("failed to unmarshal pod creation timestamp", zap.Error(err))
-				} else {
-					tags[tagStartTime] = string(rfc3339ts)
-				}
+			if rfc3339ts, err := ts.MarshalText(); err != nil {
+				c.logger.Error("failed to unmarshal pod creation timestamp", zap.Error(err))
 			} else {
-				tags[tagStartTime] = ts.String()
+				tags[tagStartTime] = string(rfc3339ts)
 			}
 		}
 	}