Rose seeds

Question

How cold should rose seeds get for stratification?

Answer 1

Rose seeds need 10-12 weeks (or 6-10 depending on your source) at 40 degrees or colder before they will germinate. Here are two links for preparing seed and growing roses from seed.
https://www.gardeningknowhow.com/ornamental/flowers/roses/growing-roses-from-seed.htm
https://blog.thompson-morgan.com/how-to-grow-roses-from-seed/