Dear Dan, What is the earliest part of the year I can leave my plants outside? – Red Neck Kung Fu
The answer to your question depends on the region (or zone) in which you live. Generally, plants can go outside after the threat of frost is gone. In most places, that’s usually around April or May but in some colder regions, it could even be June. You can also extend the time your plants can be outside by using a greenhouse to trap heat.
One important thing you can do is to slowly acclimate your plants to the amount of light they’ll be getting from the sun by putting them outside for just a few hours for the first week and slowly add more hours to their outdoor time. This will help you to avoid shocking your indoor plants with too much strong sunlight all at once.