well best of luck to you
typically I don't plant any of like seeds(rape, turnips or others) till later Aug, due to heat and dry weather
as planting too early can be worse some times than planting too late, all the more so since it seems like winters take longer to happen anymore with temps staying warmer and warmer later and later inbto the fall!
one thing to keep in mind also, is, when you do any soil test, and the soil needs anything to be added, it takes time for the changes to happen, before the soil is capable of growing the seeds you plant
all the more so when PH is off,
adding lime can takes months or yrs to get corrected and its never a once and done deal!
so, just keep that in mind
NEXT too, is when your looking at any seeds, most all should all have information on there growth time, as in some seeds are a 40 day, some are a 45 some are 50-60-90-100 day till they mature, so pending the seed itself(not just brand name or type of plant
as many of the same types can have all different seed to growth rates!
so, knowing this can also help determine when to plant things,