It's about weather stabilization more than frost date for me on the cusp of 5b/6a and a 90% safe frost date of May 15th. While there's been no frost after our safe date in recent memory the trend has been wetter cooler longer lasting Springs that are not helpful in starting tomatoes.
I'll be putting a few out around the 15th, but most will be planted Memorial Day weekend and plan to have some standbys still inside for hail replacements thru the 2nd week of June.
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