diff --git a/app/assets/javascripts/discourse/helpers/cold-age-class.js.es6 b/app/assets/javascripts/discourse/helpers/cold-age-class.js.es6
index 0fa515ea7a2..1727448e6fd 100644
--- a/app/assets/javascripts/discourse/helpers/cold-age-class.js.es6
+++ b/app/assets/javascripts/discourse/helpers/cold-age-class.js.es6
@@ -12,8 +12,14 @@ function coldAgeClass(property, options) {
 
   if (!dt) { return className; }
 
+  var startDate = (options && options.hash && options.hash.startDate) || new Date();
+
+  if (typeof startDate === "string") {
+    startDate = Em.Handlebars.get(this, startDate, options);
+  }
+
   // Show heat on age
-  var nowDays = daysSinceEpoch(new Date()),
+  var nowDays = daysSinceEpoch(startDate),
       epochDays = daysSinceEpoch(new Date(dt));
 
   if (nowDays - epochDays > Discourse.SiteSettings.cold_age_days_high) return className + ' coldmap-high';
diff --git a/app/assets/javascripts/discourse/templates/list/activity_column.raw.hbs b/app/assets/javascripts/discourse/templates/list/activity_column.raw.hbs
index 1eba1324169..7f532c9b57d 100644
--- a/app/assets/javascripts/discourse/templates/list/activity_column.raw.hbs
+++ b/app/assets/javascripts/discourse/templates/list/activity_column.raw.hbs
@@ -1 +1 @@
-<{{this.tagName}} class="{{cold-age-class "topic.bumpedAt" class=this.class}} activity" title="{{get "topic.bumpedAtTitle"}}"><a href="{{get "topic.lastPostUrl"}}">{{format-date "topic.bumpedAt" format="tiny" noTitle=true}}</a></{{this.tagName}}>
+<{{this.tagName}} class="{{cold-age-class "topic.createdAt" startDate="topic.bumpedAt" class=this.class}} activity" title="{{get "topic.bumpedAtTitle"}}"><a href="{{get "topic.lastPostUrl"}}">{{format-date "topic.bumpedAt" format="tiny" noTitle=true}}</a></{{this.tagName}}>