diff --git a/scripts/team-cron.js b/scripts/team-cron.js
new file mode 100644
index 0000000000..1903009691
--- /dev/null
+++ b/scripts/team-cron.js
@@ -0,0 +1,80 @@
+import forEach from 'lodash/forEach';
+import { model as Group } from '../website/server/models/group';
+import { model as User } from '../website/server/models/user';
+import * as Tasks from '../website/server/models/task';
+import { daysSince, shouldDo } from '../website/common/script/cron';
+
+const TASK_VALUE_CHANGE_FACTOR = 0.9747;
+const MIN_TASK_VALUE = -47.27;
+
+async function updateTeamTasks (team) {
+  const toSave = [];
+  const teamLeader = await User.findOne({ _id: team.leader }, 'preferences').exec();
+
+  if (
+    !team.cron || !team.cron.lastProcessed
+    || daysSince(team.cron.lastProcessed, teamLeader.preferences) > 0
+  ) {
+    const tasks = await Tasks.Task.find({
+      'group.id': team._id,
+      'group.assignedUsers': [],
+      userId: { $exists: false },
+      $or: [
+        { type: 'todo', completed: false },
+        { type: { $in: ['habit', 'daily'] } },
+      ],
+    }).exec();
+
+    const tasksByType = {
+      habits: [], dailys: [], todos: [], rewards: [],
+    };
+    forEach(tasks, task => tasksByType[`${task.type}s`].push(task));
+
+    forEach(tasksByType.habits, habit => {
+      if (!(habit.up && habit.down) && habit.value !== 0) {
+        habit.value *= 0.5;
+        if (Math.abs(habit.value) < 0.1) habit.value = 0;
+        toSave.push(habit.save());
+      }
+    });
+    forEach(tasksByType.todos, todo => {
+      if (!todo.completed) {
+        const delta = TASK_VALUE_CHANGE_FACTOR ** todo.value;
+        todo.value -= delta;
+        if (todo.value < MIN_TASK_VALUE) todo.value = MIN_TASK_VALUE;
+        toSave.push(todo.save());
+      }
+    });
+    forEach(tasksByType.dailys, daily => {
+      if (daily.completed) {
+        daily.completed = false;
+      } else if (shouldDo(team.cron.lastProcessed, daily, teamLeader.preferences)) {
+        const delta = TASK_VALUE_CHANGE_FACTOR ** daily.value;
+        daily.value -= delta;
+        if (daily.value < MIN_TASK_VALUE) daily.value = MIN_TASK_VALUE;
+      }
+      daily.isDue = shouldDo(new Date(), daily, teamLeader.preferences);
+      if (daily.isModified()) toSave.push(daily.save());
+    });
+
+    if (!team.cron) team.cron = {};
+    team.cron.lastProcessed = new Date();
+    toSave.push(team.save());
+  }
+
+  return Promise.all(toSave);
+}
+
+export default async function processTeamsCron () {
+  const activeTeams = await Group.find({
+    'purchased.plan.customerId': { $exists: true },
+    $or: [
+      { 'purchased.plan.dateTerminated': { $exists: false } },
+      { 'purchased.plan.dateTerminated': null },
+      { 'purchased.plan.dateTerminated': { $gt: new Date() } },
+    ],
+  }).exec();
+
+  const cronPromises = activeTeams.map(updateTeamTasks);
+  return Promise.all(cronPromises);
+}
diff --git a/website/server/middlewares/cron.js b/website/server/middlewares/cron.js
index fd9312e25d..664d65cc3e 100644
--- a/website/server/middlewares/cron.js
+++ b/website/server/middlewares/cron.js
@@ -73,37 +73,13 @@ async function cronAsync (req, res) {
       return null;
     }
 
-    const teamsLed = await user.teamsLed();
-    let tasksQuery;
-
-    if (teamsLed.length > 0) {
-      tasksQuery = {
-        $and: [
-          {
-            $or: [
-              { userId: user._id },
-              { userId: { $exists: false }, 'group.id': { $in: teamsLed }, 'group.assignedUsers': { $size: 0 } },
-            ],
-          },
-          {
-            $or: [
-              { type: 'todo', completed: false },
-              { type: { $in: ['habit', 'daily'] } },
-            ],
-          },
-        ],
-      };
-    } else {
-      tasksQuery = {
-        userId: user._id,
-        $or: [
-          { type: 'todo', completed: false },
-          { type: { $in: ['habit', 'daily'] } },
-        ],
-      };
-    }
-
-    const tasks = await Tasks.Task.find(tasksQuery).exec();
+    const tasks = await Tasks.Task.find({
+      userId: user._id,
+      $or: [ // Exclude completed todos
+        { type: 'todo', completed: false },
+        { type: { $in: ['habit', 'daily', 'reward'] } },
+      ],
+    }).exec();
 
     const tasksByType = {
       habits: [], dailys: [], todos: [], rewards: [],
@@ -141,36 +117,20 @@ async function cronAsync (req, res) {
 
     // Save user and tasks
     const toSave = [user.save()];
-    const groupTasks = [];
-    const groupTasksByType = {
-      habits: [], dailys: [], todos: [], rewards: [],
-    };
-    for (const task of tasks) {
+    tasks.forEach(async task => {
       if (task.isModified()) toSave.push(task.save());
       if (task.isModified() && task.group && task.group.taskId) {
-        const groupTask = await Tasks.Task.findOne({ // eslint-disable-line no-await-in-loop
+        const groupTask = await Tasks.Task.findOne({
           _id: task.group.taskId,
         }).exec();
+
         if (groupTask) {
-          groupTasks.push(groupTask);
-          groupTasksByType[`${groupTask.type}s`].push(groupTask);
+          let delta = (0.9747 ** task.value) * -1;
+          if (groupTask.group.assignedUsers) delta /= groupTask.group.assignedUsers.length;
+          await groupTask.scoreChallengeTask(delta, 'down');
         }
       }
-    }
-    if (groupTasks.length > 0) {
-      await cron({
-        user,
-        tasksByType: groupTasksByType,
-        now,
-        daysMissed,
-        analytics,
-        timezoneUtcOffsetFromUserPrefs,
-        headers: req.headers,
-      });
-      groupTasks.forEach(async cronnedGroupTask => {
-        if (cronnedGroupTask.isModified()) toSave.push(cronnedGroupTask.save());
-      });
-    }
+    });
     await Promise.all(toSave);
 
     await Group.processQuestProgress(user, progress);
diff --git a/website/server/models/group.js b/website/server/models/group.js
index e8d98627fe..d93b0689da 100644
--- a/website/server/models/group.js
+++ b/website/server/models/group.js
@@ -144,6 +144,9 @@ export const schema = new Schema({
     slug: { $type: String },
     name: { $type: String },
   }],
+  cron: {
+    lastProcessed: { $type: Date },
+  },
 }, {
   strict: true,
   minimize: false, // So empty objects are returned