Pink Glow is generally regarded as a hardy plant, so it can be safe to leave outdoors for the majority of winter (although if in doubt, using a row cover is often a good idea).
Growing Pink Glow from seed
By our calculations, you should look at sowing Pink Glow about 49 days before your last frost date.
Transplanting Pink Glow
Pink Glow is hardy, so ensure you wait until all danger of frost has passed in your area before considering planting outside.