diff --git a/common/params_keys.h b/common/params_keys.h
index 834afec13a..b250f38090 100644
--- a/common/params_keys.h
+++ b/common/params_keys.h
@@ -120,5 +120,7 @@ inline static std::unordered_map<std::string, uint32_t> keys = {
     {"UpdaterState", CLEAR_ON_MANAGER_START},
     {"UpdaterTargetBranch", CLEAR_ON_MANAGER_START},
     {"UpdaterLastFetchTime", PERSISTENT},
+    {"UptimeOffroad", PERSISTENT},
+    {"UptimeOnroad", PERSISTENT},
     {"Version", PERSISTENT},
 };
diff --git a/system/hardware/hardwared.py b/system/hardware/hardwared.py
index a5b50a38de..947129142e 100755
--- a/system/hardware/hardwared.py
+++ b/system/hardware/hardwared.py
@@ -56,6 +56,11 @@ OFFROAD_DANGER_TEMP = 75
 prev_offroad_states: dict[str, tuple[bool, str | None]] = {}
 
 
+def read_uptime_from_param(params, param: str) -> float:
+  try:
+    return float(params.get(param))
+  except (TypeError, ValueError):
+    return 0.0
 
 def set_offroad_alert_if_changed(offroad_alert: str, show_alert: bool, extra_text: str | None=None):
   if prev_offroad_states.get(offroad_alert, None) == (show_alert, extra_text):
@@ -201,6 +206,10 @@ def hardware_thread(end_event, hw_queue) -> None:
   params = Params()
   power_monitor = PowerMonitoring()
 
+  uptime_offroad: float = read_uptime_from_param(params, "UptimeOffroad")
+  uptime_onroad: float = read_uptime_from_param(params, "UptimeOnroad")
+  last_uptime_ts: float = time.monotonic()
+
   HARDWARE.initialize_hardware()
   thermal_config = HARDWARE.get_thermal_config()
 
@@ -444,6 +453,17 @@ def hardware_thread(end_event, hw_queue) -> None:
 
     params.put_bool_nonblocking("NetworkMetered", msg.deviceState.networkMetered)
 
+    now_ts = time.monotonic()
+    if off_ts:
+      uptime_offroad += now_ts - max(last_uptime_ts, off_ts)
+    elif started_ts:
+      uptime_onroad += now_ts - max(last_uptime_ts, started_ts)
+    last_uptime_ts = now_ts
+
+    if (count % int(60. / DT_HW)) == 0:
+      params.put("UptimeOffroad", str(uptime_offroad))
+      params.put("UptimeOnroad", str(uptime_onroad))
+
     count += 1
     should_start_prev = should_start
 
diff --git a/system/manager/manager.py b/system/manager/manager.py
index 01e02bf720..ddb7638a76 100755
--- a/system/manager/manager.py
+++ b/system/manager/manager.py
@@ -40,6 +40,8 @@ def manager_init() -> None:
     ("HasAcceptedTerms", "0"),
     ("LanguageSetting", "main_en"),
     ("OpenpilotEnabledToggle", "1"),
+    ("UptimeOffroad", "0.0"),
+    ("UptimeOnroad", "0.0"),
     ("LongitudinalPersonality", str(log.LongitudinalPersonality.standard)),
   ]