diff --git a/CHANGELOG.md b/CHANGELOG.md
index 96334af67cc..28d17b74d6c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@
 * [CHANGE] General: enabled `-log.buffered` by default. The `-log.buffered` has been deprecated and will be removed in Mimir 2.13. #6131
 * [CHANGE] Ingester: changed default `-blocks-storage.tsdb.series-hash-cache-max-size-bytes` setting from `1GB` to `350MB`. The new default cache size is enough to store the hashes for all series in a ingester, assuming up to 2M in-memory series per ingester and using the default 13h retention period for local TSDB blocks in the ingesters. #6129
 * [CHANGE] Query-frontend: removed `cortex_query_frontend_workers_enqueued_requests_total`. Use `cortex_query_frontend_enqueue_duration_seconds_count` instead. #6121
+* [CHANGE] Ingester: changed the default value for the experimental configuration parameter `-blocks-storage.tsdb.early-head-compaction-min-estimated-series-reduction-percentage` from 10 to 15. #6186
 * [FEATURE] Query-frontend: add experimental support for query blocking. Queries are blocked on a per-tenant basis and is configured via the limit `blocked_queries`. #5609
 * [FEATURE] Vault: Added support for new Vault authentication methods: `AppRole`, `Kubernetes`, `UserPass` and `Token`. #6143
 * [ENHANCEMENT] Ingester: exported summary `cortex_ingester_inflight_push_requests_summary` tracking total number of inflight requests in percentile buckets. #5845
diff --git a/cmd/mimir/config-descriptor.json b/cmd/mimir/config-descriptor.json
index dcdcc91ae72..f7e64e58b85 100644
--- a/cmd/mimir/config-descriptor.json
+++ b/cmd/mimir/config-descriptor.json
@@ -8160,7 +8160,7 @@
               "required": false,
               "desc": "When the early compaction is enabled, the early compaction is triggered only if the estimated series reduction is at least the configured percentage (0-100).",
               "fieldValue": null,
-              "fieldDefaultValue": 10,
+              "fieldDefaultValue": 15,
               "fieldFlag": "blocks-storage.tsdb.early-head-compaction-min-estimated-series-reduction-percentage",
               "fieldType": "int",
               "fieldCategory": "experimental"
diff --git a/cmd/mimir/help-all.txt.tmpl b/cmd/mimir/help-all.txt.tmpl
index 705e3948cae..f1836968c69 100644
--- a/cmd/mimir/help-all.txt.tmpl
+++ b/cmd/mimir/help-all.txt.tmpl
@@ -746,7 +746,7 @@ Usage of ./cmd/mimir/mimir:
   -blocks-storage.tsdb.dir string
     	Directory to store TSDBs (including WAL) in the ingesters. This directory is required to be persisted between restarts. (default "./tsdb/")
   -blocks-storage.tsdb.early-head-compaction-min-estimated-series-reduction-percentage int
-    	[experimental] When the early compaction is enabled, the early compaction is triggered only if the estimated series reduction is at least the configured percentage (0-100). (default 10)
+    	[experimental] When the early compaction is enabled, the early compaction is triggered only if the estimated series reduction is at least the configured percentage (0-100). (default 15)
   -blocks-storage.tsdb.early-head-compaction-min-in-memory-series int
     	[experimental] When the number of in-memory series in the ingester is equal to or greater than this setting, the ingester tries to compact the TSDB Head. The early compaction removes from the memory all samples and inactive series up until -ingester.active-series-metrics-idle-timeout time ago. After an early compaction, the ingester will not accept any sample with a timestamp older than -ingester.active-series-metrics-idle-timeout time ago (unless out of order ingestion is enabled). The ingester checks every -blocks-storage.tsdb.head-compaction-interval whether an early compaction is required. Use 0 to disable it.
   -blocks-storage.tsdb.flush-blocks-on-shutdown
diff --git a/docs/sources/mimir/references/configuration-parameters/index.md b/docs/sources/mimir/references/configuration-parameters/index.md
index 22cbc2ecdde..ad609046af1 100644
--- a/docs/sources/mimir/references/configuration-parameters/index.md
+++ b/docs/sources/mimir/references/configuration-parameters/index.md
@@ -3780,7 +3780,7 @@ tsdb:
   # triggered only if the estimated series reduction is at least the configured
   # percentage (0-100).
   # CLI flag: -blocks-storage.tsdb.early-head-compaction-min-estimated-series-reduction-percentage
-  [early_head_compaction_min_estimated_series_reduction_percentage: <int> | default = 10]
+  [early_head_compaction_min_estimated_series_reduction_percentage: <int> | default = 15]
 ```
 
 ### compactor
diff --git a/pkg/storage/tsdb/config.go b/pkg/storage/tsdb/config.go
index c387be5567f..dccde6bc954 100644
--- a/pkg/storage/tsdb/config.go
+++ b/pkg/storage/tsdb/config.go
@@ -304,7 +304,7 @@ func (cfg *TSDBConfig) RegisterFlags(f *flag.FlagSet) {
 	f.Int64Var(&cfg.BlockPostingsForMatchersCacheMaxBytes, "blocks-storage.tsdb.block-postings-for-matchers-cache-max-bytes", tsdb.DefaultPostingsForMatchersCacheMaxBytes, "Maximum size in bytes of the cache for postings for matchers in each compacted block when TTL is greater than 0.")
 	f.BoolVar(&cfg.BlockPostingsForMatchersCacheForce, "blocks-storage.tsdb.block-postings-for-matchers-cache-force", tsdb.DefaultPostingsForMatchersCacheForce, "Force the cache to be used for postings for matchers in compacted blocks, even if it's not a concurrent (query-sharding) call.")
 	f.Int64Var(&cfg.EarlyHeadCompactionMinInMemorySeries, "blocks-storage.tsdb.early-head-compaction-min-in-memory-series", 0, fmt.Sprintf("When the number of in-memory series in the ingester is equal to or greater than this setting, the ingester tries to compact the TSDB Head. The early compaction removes from the memory all samples and inactive series up until -%s time ago. After an early compaction, the ingester will not accept any sample with a timestamp older than -%s time ago (unless out of order ingestion is enabled). The ingester checks every -%s whether an early compaction is required. Use 0 to disable it.", activeseries.IdleTimeoutFlag, activeseries.IdleTimeoutFlag, headCompactionIntervalFlag))
-	f.IntVar(&cfg.EarlyHeadCompactionMinEstimatedSeriesReductionPercentage, "blocks-storage.tsdb.early-head-compaction-min-estimated-series-reduction-percentage", 10, "When the early compaction is enabled, the early compaction is triggered only if the estimated series reduction is at least the configured percentage (0-100).")
+	f.IntVar(&cfg.EarlyHeadCompactionMinEstimatedSeriesReductionPercentage, "blocks-storage.tsdb.early-head-compaction-min-estimated-series-reduction-percentage", 15, "When the early compaction is enabled, the early compaction is triggered only if the estimated series reduction is at least the configured percentage (0-100).")
 
 	cfg.HeadCompactionIntervalJitterEnabled = true
 }