Direct seeding cukes is always the best option assuming it is done properly and at the right time. Same for most all members of the family.

Consistent studies and reports show that direct seeded cukes will always quickly catch up and surpass transplants, are less susceptible to early disease and pest problems, and often out-produce the transplants because all the early stress factors transplants have to deal with are avoided.

Dave

I always direct sow cukes. They are super easy to start this way and grow quickly. No need to start indoors which is a lot more work. The only issue I have is that the sprouts can be munched on by slugs so I sprinkle a little iron phosphate slug bait around them.

I usually sow them sometime in late June, which is on the late side, but that is because they grow faster than the tomatoes and I like them to mature at about the same time (for cucumber/tomato salads).