Since they don't all get planted out at the same time anyway - peppers are slower to grow than tomatoes but require warmer soil than tomatoes - I'd use the 10 th date. Cucumbers work MUCH better when direct seeded.

Dave

Hi John,
Well, even though I grow mostly annual flowers, the terms used to suggest seed starting times are the same. Usually youâÂÂll see something like âÂÂStart your seeds 6 to 8 weeks before the last expected frost date in your area.â So, according to that, you would start your tomato seeds about 6 to 8 weeks before the 10th of May.
The reason for suggesting that you plant the seedling about 2 weeks after that last frost date is to give the soil time to warm up a bit. The seedlings need to be hardened off first anyway. Generally, if you wait until your night temperatures are staying above about 50 deg F, you should be safe to plant tomato seedlings outside. It could, of course, take more than 2 weeks after that last frost for that to occur.

Hope this helps,
Art