New seasons of Zombies, Run! launch in mid-Spring. After the official launch date, we release 2 new missions a week. We also have a mid-season hiatus which lasts for around 1 month. The final mission are usually release around the start of Autumn/Fall.
If you can't see any new missions on the week they've been released, then try restarting your device, and restarting the app.
Please keep an eye on our blog for updates on new seasons & new episode releases.