diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 19770c9f..3dcce593 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -8,6 +8,7 @@
 - feat: report GA events with version
 - feat: run load test with the given limit and burst as rate limiter
 - change: update API models
+- feat: report runner state
 
 ## v0.2.2 (2021-12-07)
 
diff --git a/internal/boomer/output.go b/internal/boomer/output.go
index 3f897e91..958134fe 100644
--- a/internal/boomer/output.go
+++ b/internal/boomer/output.go
@@ -125,8 +125,8 @@ func (o *ConsoleOutput) OnEvent(data map[string]interface{}) {
 	}
 
 	currentTime := time.Now()
-	println(fmt.Sprintf("Current time: %s, Users: %d, Total RPS: %d, Total Fail Ratio: %.1f%%",
-		currentTime.Format("2006/01/02 15:04:05"), output.UserCount, output.TotalRPS, output.TotalFailRatio*100))
+	println(fmt.Sprintf("Current time: %s, Users: %d, State: %d, Total RPS: %d, Total Fail Ratio: %.1f%%",
+		currentTime.Format("2006/01/02 15:04:05"), output.UserCount, output.State, output.TotalRPS, output.TotalFailRatio*100))
 	println(fmt.Sprintf("Accumulated Transactions: %d Passed, %d Failed",
 		output.TransactionsPassed, output.TransactionsFailed))
 	table := tablewriter.NewWriter(os.Stdout)
@@ -163,6 +163,7 @@ type statsEntryOutput struct {
 
 type dataOutput struct {
 	UserCount          int32                             `json:"user_count"`
+	State              int32                             `json:"state"`
 	TotalStats         *statsEntryOutput                 `json:"stats_total"`
 	TransactionsPassed int64                             `json:"transactions_passed"`
 	TransactionsFailed int64                             `json:"transactions_failed"`
@@ -177,6 +178,10 @@ func convertData(data map[string]interface{}) (output *dataOutput, err error) {
 	if !ok {
 		return nil, fmt.Errorf("user_count is not int32")
 	}
+	state, ok := data["state"].(int32)
+	if !ok {
+		return nil, fmt.Errorf("state is not int32")
+	}
 	stats, ok := data["stats"].([]interface{})
 	if !ok {
 		return nil, fmt.Errorf("stats is not []interface{}")
@@ -201,6 +206,7 @@ func convertData(data map[string]interface{}) (output *dataOutput, err error) {
 
 	output = &dataOutput{
 		UserCount:          userCount,
+		State:              state,
 		TotalStats:         entryTotalOutput,
 		TransactionsPassed: transactionsPassed,
 		TransactionsFailed: transactionsFailed,
@@ -321,6 +327,12 @@ var (
 			Help: "The current number of users",
 		},
 	)
+	gaugeState = prometheus.NewGauge(
+		prometheus.GaugeOpts{
+			Name: "state",
+			Help: "The current runner state, 1=initializing, 2=spawning, 3=running, 4=quitting, 5=stopped",
+		},
+	)
 	gaugeTotalRPS = prometheus.NewGauge(
 		prometheus.GaugeOpts{
 			Name: "total_rps",
@@ -377,6 +389,7 @@ func (o *PrometheusPusherOutput) OnStart() {
 		gaugeCurrentFailPerSec,
 		// gauges for total
 		gaugeUsers,
+		gaugeState,
 		gaugeTotalRPS,
 		gaugeTotalFailRatio,
 		gaugeTransactionsPassed,
@@ -401,6 +414,9 @@ func (o *PrometheusPusherOutput) OnEvent(data map[string]interface{}) {
 	// user count
 	gaugeUsers.Set(float64(output.UserCount))
 
+	// runner state
+	gaugeState.Set(float64(output.State))
+
 	// rps in total
 	gaugeTotalRPS.Set(float64(output.TotalRPS))
 
diff --git a/internal/boomer/runner.go b/internal/boomer/runner.go
index a60ba805..4d7f56b8 100644
--- a/internal/boomer/runner.go
+++ b/internal/boomer/runner.go
@@ -13,11 +13,11 @@ import (
 )
 
 const (
-	stateInit     = "ready"
-	stateSpawning = "spawning"
-	stateRunning  = "running"
-	stateStopped  = "stopped"
-	stateQuitting = "quitting"
+	stateInit     = iota + 1 // initializing
+	stateSpawning            // spawning
+	stateRunning             // running
+	stateQuitting            // quitting
+	stateStopped             // stopped
 )
 
 const (
@@ -25,7 +25,7 @@ const (
 )
 
 type runner struct {
-	state string
+	state int32
 
 	tasks           []*Task
 	totalTaskWeight int
@@ -116,6 +116,7 @@ func (r *runner) spawnWorkers(spawnCount int, spawnRate float64, quit chan bool,
 		Float64("spawnRate", spawnRate).
 		Msg("Spawning workers")
 
+	atomic.StoreInt32(&r.state, stateSpawning)
 	// TODO: spawn workers with spawnRate
 	for i := 1; i <= spawnCount; i++ {
 		select {
@@ -150,6 +151,7 @@ func (r *runner) spawnWorkers(spawnCount int, spawnRate float64, quit chan bool,
 	if spawnCompleteFunc != nil {
 		spawnCompleteFunc()
 	}
+	atomic.StoreInt32(&r.state, stateRunning)
 }
 
 // setTasks will set the runner's task list AND the total task weight
@@ -217,7 +219,7 @@ func newLocalRunner(tasks []*Task, rateLimiter RateLimiter, spawnCount int, spaw
 
 func (r *localRunner) start() {
 	// init state
-	r.state = stateInit
+	atomic.StoreInt32(&r.state, stateInit)
 	atomic.StoreInt32(&r.currentClientsNum, 0)
 	r.stats.clearAll()
 
@@ -248,6 +250,7 @@ func (r *localRunner) start() {
 		case <-ticker.C:
 			data := r.stats.collectReportData()
 			data["user_count"] = atomic.LoadInt32(&r.currentClientsNum)
+			data["state"] = atomic.LoadInt32(&r.state)
 			r.outputOnEevent(data)
 		case <-r.stopChan:
 			// stop previous goroutines without blocking
@@ -265,5 +268,7 @@ func (r *localRunner) start() {
 }
 
 func (r *localRunner) stop() {
+	atomic.StoreInt32(&r.state, stateQuitting)
 	close(r.stopChan)
+	atomic.StoreInt32(&r.state, stateStopped)
 }