--- a/.taskcluster.yml
+++ b/.taskcluster.yml
@@ -54,29 +54,34 @@ tasks:
   # takes place.
   - $if: 'tasks_for in ["hg-push", "action", "cron"]'
     then:
       $let:
         # sometimes the push user is just `ffxbld` or the like, but we want an email-like field..
         ownerEmail: {$if: '"@" in push.owner', then: '${push.owner}', else: '${push.owner}@noreply.mozilla.org'}
         # ensure there's no trailing `/` on the repo URL
         repoUrl: {$if: 'repository.url[-1] == "/"', then: {$eval: 'repository.url[:-1]'}, else: {$eval: 'repository.url'}}
+        # expire try earlier than other branches
+        expires:
+          $if: 'repository.project == "try"'
+          then: {$fromNow: '28 days'}
+          else: {$fromNow: '1 year'}
       in:
         taskId: {$if: 'tasks_for != "action"', then: '${ownTaskId}'}
         taskGroupId:
           $if: 'tasks_for == "action"'
           then:
             '${action.taskGroupId}'
           else:
             '${ownTaskId}' # same as taskId; this is how automation identifies a decision tsak
         schedulerId: 'gecko-level-${repository.level}'
 
         created: {$fromNow: ''}
         deadline: {$fromNow: '1 day'}
-        expires: {$fromNow: '1 year 1 second'} # 1 second so artifacts expire first, despite rounding errors
+        expires: {$eval: 'expires'}
         metadata:
           $merge:
             - owner: "${ownerEmail}"
               source: "${repoUrl}/raw-file/${push.revision}/.taskcluster.yml"
             - $if: 'tasks_for == "hg-push"'
               then:
                 name: "Gecko Decision Task"
                 description: 'The task that creates all of the other tasks in the task graph'
@@ -250,17 +255,17 @@ tasks:
                   --head-ref="$GECKO_HEAD_REF"
                   --head-rev="$GECKO_HEAD_REV"
                   ${extraArgs}
 
           artifacts:
             'public':
               type: 'directory'
               path: '/builds/worker/artifacts'
-              expires: {$fromNow: '1 year'}
+              expires: {$eval: expires}
 
         extra:
           $merge:
             - treeherder:
                 $merge:
                   - machine:
                       platform: gecko-decision
                   - $if: 'tasks_for == "hg-push"'