Seasonal jobs that might turn permanent - first time posting

A retailer and two warehouses near Denver are hiring seasonal staff. I am in Denver, in case local advice matters. Hours ramp up in the coming weeks. Which employers treat seasonal workers well?

Apply to several. Start dates and schedules change quickly and having options helps.

Thanks for writing this out. I went through something close to it 11 months ago, and it got easier once I kept a simple log of every call and form.