Plant chili pepper plants out after the weather has warmed. I typically wait to plant all warm weather loving plants the last week in May. Harvest all your fruit before the first fall frost.
When I plant my peppers, whether sweet or hot, I plant them roughly 15 inches apart. Now that may seem close for how large a pepper plant can get, however, I’ve found that planting them too far apart can leave some peppers exposed and causes sun scald on the fruit. When planted closer together, you don’t sacrifice production and the plants work together to protect the fruit.
Once planted, I often place a good 5-6″ layer of mulch around the row. If I’m running soaker hoses, I do so before laying the mulch. My mulch often consists of grass clipping or straw. Both will compost down throughout the season; improving your soil and feeding the plants. All that being said, I don’t often water my chili plants as the drier they are, the spicier they will be.