If I had unknown seeds in July, I would sow half of them now outdoors and keep moist. If they germinated I would keep the seedlings undercover for the winter in case they were tender and plant them out once they seemed to be coming on well in the spring. If they didn't germinate I would leave them out for the winter.
The other half, I would sow in late October and leave outdoors over the winter..
They will be easier to recognize and ID as seedlings or small plants.
This was posted in Nov. 2012. I had collected seed during the growing season of 2012. When I started to start seeds in the winter of 2013, I noticed I had Larkspur seeds from earlier years exactly the same that were in the above picture.