diff --git a/salt/manager/tools/sbin/so-boot-mine-update b/salt/manager/tools/sbin/so-boot-mine-update
new file mode 100755
index 000000000..f497d891f
--- /dev/null
+++ b/salt/manager/tools/sbin/so-boot-mine-update
@@ -0,0 +1,42 @@
+#!/bin/bash
+#
+# Copyright Security Onion Solutions LLC and/or licensed to Security Onion Solutions LLC under one
+# or more contributor license agreements. Licensed under the Elastic License 2.0 as shown at
+# https://securityonion.net/license; you may not use this file except in compliance with the
+# Elastic License 2.0.
+
+# Runs once per boot on managers (via so-boot-mine-update.service), before
+# so-boot-highstate.service. Waits for the responsive minion set to settle, then
+# pushes mine.update to all minions so mine-backed pillars (node IPs, ES/Redis/
+# Logstash discovery) are fresh before the boot highstate renders them.
+
+MAX_WAIT=${MINE_UPDATE_MAX_WAIT:-180}   # hard backstop only
+INTERVAL=10
+STABLE_CHECKS=3                          # up-count must hold steady this many polls
+elapsed=0
+prev=-1
+stable=0
+up=0
+
+# Wait for the *reachable* minion set to settle rather than for every accepted
+# key to report up: an operator may accept a minion's key and then intentionally
+# power off that host, so requiring up >= accepted would never be satisfied and
+# we'd always burn the full MAX_WAIT. Once the responsive count stops growing we
+# stop waiting and run mine.update against whoever is up.
+while [ "$elapsed" -lt "$MAX_WAIT" ]; do
+  up=$(/usr/bin/salt-run manage.up --out=json 2>/dev/null \
+    | python3 -c 'import sys,json; print(len(json.load(sys.stdin)))' 2>/dev/null)
+  up=${up:-0}
+  if [ "$up" -gt 0 ] && [ "$up" -eq "$prev" ]; then
+    stable=$((stable + 1))
+    [ "$stable" -ge "$STABLE_CHECKS" ] && break
+  else
+    stable=0
+  fi
+  prev=$up
+  sleep "$INTERVAL"
+  elapsed=$((elapsed + INTERVAL))
+done
+
+echo "so-boot-mine-update: ${up} minions up (settled after ${elapsed}s); running mine.update"
+/usr/bin/salt '*' mine.update --out=txt
diff --git a/salt/salt/master.sls b/salt/salt/master.sls
index 895150cd7..c62bd20f3 100644
--- a/salt/salt/master.sls
+++ b/salt/salt/master.sls
@@ -14,6 +14,7 @@
 
 include:
   - salt.minion
+  - salt.master.boot_mine_update
 {%   if 'vrt' in salt['pillar.get']('features', []) %}
   - salt.cloud
   - salt.cloud.reactor_config_hypervisor
diff --git a/salt/salt/master/boot_mine_update.sls b/salt/salt/master/boot_mine_update.sls
new file mode 100644
index 000000000..9f96c0ddf
--- /dev/null
+++ b/salt/salt/master/boot_mine_update.sls
@@ -0,0 +1,29 @@
+# Copyright Security Onion Solutions LLC and/or licensed to Security Onion Solutions LLC under one
+# or more contributor license agreements. Licensed under the Elastic License 2.0 as shown at
+# https://securityonion.net/license; you may not use this file except in compliance with the
+# Elastic License 2.0.
+
+# Manages /etc/systemd/system/so-boot-mine-update.service, a manager-only
+# Type=oneshot unit that pushes `salt '*' mine.update` once per boot, ordered
+# before so-boot-highstate.service so mine-backed pillars (node IPs, ES/Redis/
+# Logstash discovery) are fresh before the boot highstate renders them.
+
+include:
+  - systemd.reload
+
+so_boot_mine_update_unit_file:
+  file.managed:
+    - name: /etc/systemd/system/so-boot-mine-update.service
+    - source: salt://salt/service/so-boot-mine-update.service
+    - onchanges_in:
+      - module: systemd_reload
+
+# Only enable once setup is complete. Until then the gate file is missing and
+# the unit's own ConditionPathExists would no-op it anyway.
+so_boot_mine_update_service:
+  service.enabled:
+    - name: so-boot-mine-update.service
+    - onlyif: test -e /opt/so/state/setup-complete
+    - require:
+      - file: so_boot_mine_update_unit_file
+      - module: systemd_reload
diff --git a/salt/salt/service/so-boot-mine-update.service b/salt/salt/service/so-boot-mine-update.service
new file mode 100644
index 000000000..c5c6cdf7b
--- /dev/null
+++ b/salt/salt/service/so-boot-mine-update.service
@@ -0,0 +1,15 @@
+[Unit]
+Description=Security Onion boot-time grid mine.update (managers, runs once per boot before highstate)
+After=salt-master.service salt-minion.service network-online.target
+Wants=network-online.target
+Requires=salt-master.service salt-minion.service
+Before=so-boot-highstate.service
+ConditionPathExists=/opt/so/state/setup-complete
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/usr/sbin/so-boot-mine-update
+
+[Install]
+WantedBy=multi-user.target