Tomatoes and different heat-climate greens and plant life can all be damaged by a frost. Our ordinary closing frost date in Clark County varies from April 15 to early May, depending upon elevation.
Even after frost chance is beyond, plants along with tomatoes, peppers, squash, cucumbers, and melons develop very slowly until temperatures are always in the 70s or above. Early-planted flora can become stunted and be surpassed by lively later-planted ones.
A proper manner to get a head begin is to shop for and transplant small plant life into large pots and convey them inner at night. By alternating cool, vibrant outdoor daylight conditions and hot, inner middle-of-the-night situations, plants develop sturdy, compact stems. I start my tomatoes from seed and use this alternating heat-night/cool-day regimen to develop sturdy, robust flowers.
Although tomatoes and peppers require an extended starting length, cucumbers, squash, and melons need approximately four weeks to increase a transplantable plant. By planting seeds in 3- or 4-inch pots now, you could have flowers ready to transplant outdoors at the right time. Keep them interior until the seeds germinate, after which use the alternating in/out method.

