Ultimately, the decision will be by the states themselves; however, guidelines were set by the Whitehouse to provide a three-phased approach to reopening the US economy in light of COVID-19 and rising weather temperatures. The benchmarks for the beginning the first phase of lifted restriction include a sustained decrease in cases over a 14-day period and a return to pre-crisis conditions in hospitals.

PHASE ONE [see https://www.whitehouse.gov/openingamerica/#phase-one]
The phased approach encourages all individuals to continue good hygiene practices like washing hands and to "strongly consider" using face coverings in public. Further suggestion are that schools that are currently closed should remain so and employees who are able to telework should keep working from home. Large venues, including some restaurants, can operate under strict social distancing protocols. Gyms can open as long as they maintain social distancing guidelines, but bars should remain shuttered. The guidelines still recommend minimizing nonessential travel, and indicate vulnerable populations should remain sheltered-in-place.

PHASE TWO [see https://www.whitehouse.gov/openingamerica/#phase-two]
Non-essential travel may resume; however, “vulnerable individuals should continue to shelter in place. Employers should Continue encourage telework, whenever possible and feasible with business operations; close common areas where personnel are likely to congregate and interact, or enforce moderate social distancing protocols; and strongly consider special accommodations for personnel who are members of a vulnerable population. School however, can reopen.

PHASE THREE [see https://www.whitehouse.gov/openingamerica/#phase-three]
Here, vulnerable individuals can resume public interactions, but should practice physical distancing, minimizing exposure to social settings where distancing may not be practical, unless precautionary measures are observed. Still, low-risk populations should consider minimizing time spent in crowded environments. Employment can fully resume, but gyms, bars and large venues need to keep physical distance protocols.

See more info at: https://www.cnn.com/2020/04/16/politics/donald-trump-reopening-guidelines-coronavirus/index.html