diff --git a/pgcommitfest/commitfest/migrations/0018_commitfest_preclosure_warning_sent_at.py b/pgcommitfest/commitfest/migrations/0018_commitfest_preclosure_warning_sent_at.py
new file mode 100644
index 00000000..4c6ae1a5
--- /dev/null
+++ b/pgcommitfest/commitfest/migrations/0018_commitfest_preclosure_warning_sent_at.py
@@ -0,0 +1,17 @@
+# Generated by Django 4.2.19 on 2026-03-31 00:00
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("commitfest", "0017_make_topic_optional"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="commitfest",
+            name="preclosure_warning_sent_at",
+            field=models.DateTimeField(blank=True, null=True),
+        ),
+    ]
diff --git a/pgcommitfest/commitfest/models.py b/pgcommitfest/commitfest/models.py
index 6594e3c4..98fdac07 100644
--- a/pgcommitfest/commitfest/models.py
+++ b/pgcommitfest/commitfest/models.py
@@ -4,7 +4,8 @@
 from django.db.models import Q
 from django.shortcuts import get_object_or_404
 
-from datetime import datetime, timedelta, timezone
+from datetime import date, datetime, timedelta, timezone
+from typing import Literal
 
 from pgcommitfest.mailqueue.util import send_template_mail
 from pgcommitfest.userprofile.models import UserProfile
@@ -57,6 +58,7 @@ class CommitFest(models.Model):
     startdate = models.DateField(blank=False, null=False)
     enddate = models.DateField(blank=False, null=False)
     draft = models.BooleanField(blank=False, null=False, default=False)
+    preclosure_warning_sent_at = models.DateTimeField(blank=True, null=True)
 
     @property
     def statusstring(self):
@@ -101,6 +103,46 @@ def is_open_draft(self):
     def is_in_progress(self):
         return self.status == self.STATUS_INPROGRESS
 
+    @property
+    def preclosure_warning_date(self) -> date:
+        return self.enddate - timedelta(days=settings.PRE_CLOSURE_NOTIFICATION_DAYS)
+
+    @staticmethod
+    def _current_date() -> date:
+        return datetime.now(timezone.utc).date()
+
+    def days_until_close(self, current_date: date | None = None) -> int:
+        if current_date is None:
+            current_date = self._current_date()
+        return (self.enddate - current_date).days
+
+    def should_send_preclosure_warning(self, current_date: date | None = None) -> bool:
+        if current_date is None:
+            current_date = self._current_date()
+        return (
+            self.is_in_progress
+            and not self.preclosure_warning_sent_at
+            and self.preclosure_warning_date <= current_date <= self.enddate
+        )
+
+    def save(self, *args, **kwargs):
+        update_fields = kwargs.get("update_fields")
+        update_fields_set = set(update_fields) if update_fields is not None else None
+
+        enddate_is_updating = update_fields_set is None or "enddate" in update_fields_set
+        if self.pk and enddate_is_updating:
+            # I don't love adding a query here, but it seems like the best way to get the old enddate.
+            old_enddate = (
+                type(self).objects.filter(pk=self.pk).values_list("enddate", flat=True).first()
+            )
+            if old_enddate is not None and old_enddate != self.enddate:
+                self.preclosure_warning_sent_at = None
+                if update_fields_set is not None:
+                    update_fields_set.add("preclosure_warning_sent_at")
+                    kwargs["update_fields"] = update_fields_set
+
+        super().save(*args, **kwargs)
+
     def to_json(self):
         return {
             "id": self.id,
@@ -225,12 +267,117 @@ def send_closure_notifications(self):
                 },
             )
 
+    @staticmethod
+    def _notification_email_for_user(user: User) -> str:
+        try:
+            if user.userprofile and user.userprofile.notifyemail:
+                return user.userprofile.notifyemail.email
+        except UserProfile.DoesNotExist:
+            pass
+        return user.email
+
+    @staticmethod
+    def _wants_role_notification(
+        user: User, role: Literal["author", "reviewer", "committer"]
+    ) -> bool:
+        try:
+            profile = user.userprofile
+        except UserProfile.DoesNotExist:
+            return role == "author"
+
+        if role == "author":
+            return profile.notify_all_author
+        if role == "reviewer":
+            return profile.notify_all_reviewer
+        if role == "committer":
+            return profile.notify_all_committer
+
+        return False
+
+    def send_preclosure_notifications(self, days_remaining: int | None = None) -> None:
+        """Send pre-closure reminder notifications to involved users."""
+        if days_remaining is None:
+            days_remaining = self.days_until_close()
+
+        if self.preclosure_warning_sent_at:
+            return
+
+        open_pocs = list(
+            self.patchoncommitfest_set.filter(
+                status__in=PatchOnCommitFest.OPEN_STATUSES
+            )
+            .select_related("patch", "patch__committer__user")
+            .prefetch_related(
+                "patch__authors",
+                "patch__reviewers",
+                "patch__subscribers",
+            )
+        )
+        if not open_pocs:
+            return
+
+        recipients_patches = {}
+        for poc in open_pocs:
+            patch = poc.patch
+            recipients = set()
+
+            for author in patch.authors.all():
+                if self._wants_role_notification(author, "author"):
+                    recipients.add(author)
+
+            for reviewer in patch.reviewers.all():
+                if self._wants_role_notification(reviewer, "reviewer"):
+                    recipients.add(reviewer)
+
+            if patch.committer and self._wants_role_notification(
+                patch.committer.user, "committer"
+            ):
+                recipients.add(patch.committer.user)
+
+            recipients.update(patch.subscribers.all())
+
+            for recipient in recipients:
+                if recipient.id not in recipients_patches:
+                    recipients_patches[recipient.id] = {
+                        "user": recipient,
+                        "patches": {},
+                    }
+                recipients_patches[recipient.id]["patches"][patch.id] = poc
+
+        if not recipients_patches:
+            return
+
+        for payload in recipients_patches.values():
+            user = payload["user"]
+            patches = list(payload["patches"].values())
+            send_template_mail(
+                settings.NOTIFICATION_FROM,
+                None,
+                self._notification_email_for_user(user),
+                (
+                    f"Commitfest {self.name} closes in {days_remaining} days "
+                    "and your patches need attention"
+                ),
+                "mail/commitfest_preclosure_warning.txt",
+                {
+                    "user": user,
+                    "commitfest": self,
+                    "patches": patches,
+                    "days_remaining": days_remaining,
+                },
+            )
+
+        self.preclosure_warning_sent_at = datetime.now(timezone.utc)
+        self.save(update_fields=["preclosure_warning_sent_at"])
+
     @staticmethod
     def _are_relevant_commitfests_up_to_date(cfs, current_date):
         inprogress_cf = cfs["in_progress"]
 
         if inprogress_cf and inprogress_cf.enddate < current_date:
             return False
+        if inprogress_cf and inprogress_cf.should_send_preclosure_warning():
+            return False
 
         if cfs["open"].startdate <= current_date:
             return False
@@ -243,7 +390,7 @@ def _are_relevant_commitfests_up_to_date(cfs, current_date):
     @classmethod
     def _refresh_relevant_commitfests(cls, for_update):
         cfs = CommitFest.relevant_commitfests(for_update=for_update, refresh=False)
-        current_date = datetime.now(timezone.utc).date()
+        current_date = cls._current_date()
 
         if cls._are_relevant_commitfests_up_to_date(cfs, current_date):
             return cfs
@@ -261,6 +408,10 @@ def _refresh_relevant_commitfests(cls, for_update):
                 inprogress_cf.save()
                 inprogress_cf.auto_move_active_patches()
                 inprogress_cf.send_closure_notifications()
+            elif inprogress_cf and inprogress_cf.should_send_preclosure_warning():
+                inprogress_cf.send_preclosure_notifications(
+                    days_remaining=inprogress_cf.days_until_close()
+                )
 
             open_cf = cfs["open"]
 
diff --git a/pgcommitfest/commitfest/templates/mail/commitfest_preclosure_warning.txt b/pgcommitfest/commitfest/templates/mail/commitfest_preclosure_warning.txt
new file mode 100644
index 00000000..e64a5325
--- /dev/null
+++ b/pgcommitfest/commitfest/templates/mail/commitfest_preclosure_warning.txt
@@ -0,0 +1,19 @@
+Commitfest {{commitfest.name}} will auto-close in {{days_remaining}} days.
+
+You are involved in {{patches|length}} open patch{{patches|length|pluralize:"es"}}:
+
+{% for poc in patches %}
+  - {{poc.patch.name}}
+    https://commitfest.postgresql.org/patch/{{poc.patch.id}}/
+{% endfor %}
+
+Please take action on {{patches|length|pluralize:"this patch,these patches"}} before close:
+
+1. Move {{patches|length|pluralize:"it,them"}} to the next commitfest if work should continue.
+
+2. Or close {{patches|length|pluralize:"it,them"}} with an appropriate status (Withdrawn, Returned with feedback, etc.)
+
+--
+This is an automated message from the PostgreSQL Commitfest app.
+To manage your notification preferences, visit:
+https://commitfest.postgresql.org/userprofile/
diff --git a/pgcommitfest/commitfest/tests/test_closure_notifications.py b/pgcommitfest/commitfest/tests/test_closure_notifications.py
index eb7cfc7a..ef411164 100644
--- a/pgcommitfest/commitfest/tests/test_closure_notifications.py
+++ b/pgcommitfest/commitfest/tests/test_closure_notifications.py
@@ -8,6 +8,7 @@
 
 from pgcommitfest.commitfest.models import (
     CfbotBranch,
+    Committer,
     CommitFest,
     Patch,
     PatchHistory,
@@ -441,3 +442,54 @@ def test_draft_cf_moves_active_patches_to_next_draft(alice, bob):
 
     # No closure email for moved patches
     assert QueuedMail.objects.count() == 0
+
+
+def test_send_preclosure_notifications_to_all_involved_roles(
+    alice, bob, charlie, dave, in_progress_cf
+):
+    """Pre-closure reminder should notify involved users based on role preferences."""
+    UserProfile.objects.create(user=bob, notify_all_reviewer=True)
+    UserProfile.objects.create(user=charlie, notify_all_committer=True)
+    committer = Committer.objects.create(user=charlie)
+
+    patch = Patch.objects.create(name="Preclose Patch", committer=committer)
+    patch.authors.add(alice)
+    patch.reviewers.add(bob)
+    patch.subscribers.add(dave)
+    PatchOnCommitFest.objects.create(
+        patch=patch,
+        commitfest=in_progress_cf,
+        enterdate=datetime.now(),
+        status=PatchOnCommitFest.STATUS_REVIEW,
+    )
+
+    in_progress_cf.send_preclosure_notifications(
+        days_remaining=settings.PRE_CLOSURE_NOTIFICATION_DAYS
+    )
+
+    assert QueuedMail.objects.count() == 4
+    receivers = set(QueuedMail.objects.values_list("receiver", flat=True))
+    assert receivers == {alice.email, bob.email, charlie.email, dave.email}
+    in_progress_cf.refresh_from_db()
+    assert in_progress_cf.preclosure_warning_sent_at is not None
+
+
+def test_preclosure_notifications_are_sent_only_once(alice, in_progress_cf):
+    """Pre-closure reminder should be idempotent for a commitfest."""
+    patch = Patch.objects.create(name="Single Reminder Patch")
+    patch.authors.add(alice)
+    PatchOnCommitFest.objects.create(
+        patch=patch,
+        commitfest=in_progress_cf,
+        enterdate=datetime.now(),
+        status=PatchOnCommitFest.STATUS_REVIEW,
+    )
+
+    in_progress_cf.send_preclosure_notifications(
+        days_remaining=settings.PRE_CLOSURE_NOTIFICATION_DAYS
+    )
+    in_progress_cf.send_preclosure_notifications(
+        days_remaining=settings.PRE_CLOSURE_NOTIFICATION_DAYS
+    )
+
+    assert QueuedMail.objects.count() == 1
diff --git a/pgcommitfest/commitfest/tests/test_refresh_commitfests.py b/pgcommitfest/commitfest/tests/test_refresh_commitfests.py
index dda1fc9d..aae4b07d 100644
--- a/pgcommitfest/commitfest/tests/test_refresh_commitfests.py
+++ b/pgcommitfest/commitfest/tests/test_refresh_commitfests.py
@@ -8,6 +8,7 @@
     Patch,
     PatchOnCommitFest,
 )
+from pgcommitfest.mailqueue.models import QueuedMail
 
 pytestmark = pytest.mark.django_db
 
@@ -156,3 +157,89 @@ def test_no_changes_when_up_to_date(commitfests):
     assert open_cf.status == CommitFest.STATUS_OPEN
     assert draft_cf.status == CommitFest.STATUS_OPEN
     assert CommitFest.objects.count() == initial_cf_count
+
+
+@freeze_time("2024-11-23")
+def test_preclosure_notifications_trigger_7_days_before_close(commitfests, alice):
+    """In-progress CF should send pre-closure notifications exactly once."""
+    in_progress_cf = commitfests["in_progress"]
+    patch = Patch.objects.create(name="Reminder Patch")
+    patch.authors.add(alice)
+    PatchOnCommitFest.objects.create(
+        patch=patch,
+        commitfest=in_progress_cf,
+        enterdate=datetime.now(),
+        status=PatchOnCommitFest.STATUS_REVIEW,
+    )
+
+    CommitFest._refresh_relevant_commitfests(for_update=False)
+    CommitFest._refresh_relevant_commitfests(for_update=False)
+
+    assert QueuedMail.objects.count() == 1
+    in_progress_cf.refresh_from_db()
+    assert in_progress_cf.preclosure_warning_sent_at is not None
+
+
+@freeze_time("2024-11-24")
+def test_preclosure_notifications_trigger_on_first_check_inside_window(
+    commitfests, alice
+):
+    """The reminder should still be sent if the site is first hit after the window opens."""
+    in_progress_cf = commitfests["in_progress"]
+    patch = Patch.objects.create(name="Late Reminder Patch")
+    patch.authors.add(alice)
+    PatchOnCommitFest.objects.create(
+        patch=patch,
+        commitfest=in_progress_cf,
+        enterdate=datetime.now(),
+        status=PatchOnCommitFest.STATUS_REVIEW,
+    )
+
+    CommitFest._refresh_relevant_commitfests(for_update=False)
+
+    assert QueuedMail.objects.count() == 1
+    mail = QueuedMail.objects.get()
+    assert "closes in 6 days" in mail.fullmsg
+    in_progress_cf.refresh_from_db()
+    assert in_progress_cf.preclosure_warning_sent_at is not None
+
+
+def test_changing_enddate_clears_preclosure_warning_and_allows_resend(
+    commitfests, alice
+):
+    """Moving the close date should clear the reminder timestamp and reopen the flow."""
+    in_progress_cf = commitfests["in_progress"]
+    patch = Patch.objects.create(name="Rescheduled Reminder Patch")
+    patch.authors.add(alice)
+    PatchOnCommitFest.objects.create(
+        patch=patch,
+        commitfest=in_progress_cf,
+        enterdate=datetime.now(),
+        status=PatchOnCommitFest.STATUS_REVIEW,
+    )
+
+    with freeze_time("2024-11-24"):
+        CommitFest._refresh_relevant_commitfests(for_update=False)
+
+    assert QueuedMail.objects.count() == 1
+    in_progress_cf.refresh_from_db()
+    assert in_progress_cf.preclosure_warning_sent_at is not None
+
+    in_progress_cf.enddate = datetime(2024, 12, 7).date()
+    in_progress_cf.save(update_fields=["enddate"])
+    in_progress_cf.refresh_from_db()
+    assert in_progress_cf.preclosure_warning_sent_at is None
+
+    with freeze_time("2024-11-24"):
+        CommitFest._refresh_relevant_commitfests(for_update=False)
+
+    assert QueuedMail.objects.count() == 1
+
+    with freeze_time("2024-11-30"):
+        CommitFest._refresh_relevant_commitfests(for_update=False)
+
+    assert QueuedMail.objects.count() == 2
+    mail = QueuedMail.objects.order_by("-id").first()
+    assert "closes in 7 days" in mail.fullmsg
+    in_progress_cf.refresh_from_db()
+    assert in_progress_cf.preclosure_warning_sent_at is not None
diff --git a/pgcommitfest/settings.py b/pgcommitfest/settings.py
index 07e4adaf..dffad9d8 100644
--- a/pgcommitfest/settings.py
+++ b/pgcommitfest/settings.py
@@ -173,6 +173,8 @@
 AUTO_MOVE_EMAIL_ACTIVITY_DAYS = 30
 # Patches failing CI for longer than this many days will NOT be auto-moved
 AUTO_MOVE_MAX_FAILING_DAYS = 21
+# Send pre-closure reminders this many days before an in-progress CF ends
+PRE_CLOSURE_NOTIFICATION_DAYS = 7
 
 # Load local settings overrides
 try: