Keep in mind when planting that Steel City is thought of as very hardy, so this plant will tend to survive through freezing conditions.
Try to ensure a gap of at least
4.68 inches (12.0 cm) when sowing to prevent overcrowding your seedlings.
By our calculations, you should look at sowing Steel City about 63 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Steel City is a very hardy plant.