In 1981, the governments of Saskatchewan and Canada signed an agreement. This would make sure that a park would be created. After the agreement was signed, Parks Canada bought two ranches. These ranches were near the Frenchman River and were . In 1988, many organisations came together to add to the 1981 agreement. This would make it so that Grasslands National Park would be created. The plan for the park would be that it would be around . Parks Canada continued to buy more land for the park from ranchers.