Nottingham 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). Nottingham needs a soil ph of 6.1 to 7.8 (weakly acidic soil - weakly alkaline soil).
Growing Nottingham from seed
By our calculations, you should look at sowing Nottingham about 5 days after your last frost date.
Transplanting Nottingham
Nottingham is hardy, so ensure you wait until all danger of frost has passed in your area before considering planting outside.