SACRAMENTO — The governors of Nevada and Colorado signed on Monday to a pact of Western states organized by California, Oregon and Washington to coordinate their reopening during the coronavirus pandemic.

California Gov. Gavin Newsom, Oregon Gov. Kate Brown and Washington Gov. Jay Inslee announced the agreement two weeks ago, as President Trump was pressuring states to rescind their stay-at-home orders and restart the economy. States in the Northeast, the Midwest and the South have arranged similar pacts.

The Western governors said their strategy would put the health of their residents and science before politics. So far, they have retained most restrictions on public life, moving only to allow some elective surgeries to resume.

“This now allows all five states to begin to work even more closely and more collaboratively,” Newsom said during a news conference. “I must say, it’s a wonderful thing when chiefs of staff of all the governors get on the phone and are comparing and contrasting best practices in real time, are sharing data, sharing information. This partnership has already become very, very meaningful.”

It’s unclear, however, how much the pact actually will dictate the timeline on which each state loosens its stay-at-home order.

Colorado Gov. Jared Polis allowed the order there to expire Sunday, entering a new phase called “safer at home” that permits real estate showings in addition to elective surgeries. Retail businesses and personal services, such as hair salons, can reopen Friday if they follow certain safety protocols, and commercial businesses can bring as many as half their employees back into the office starting next week.

Although California also now allows elective surgeries, Newsom has otherwise resisted calls to modify his order and allow parts of the state with few coronavirus cases to chart their own course. He said Monday that if people continue to follow social distancing guidelines, he was “a few weeks away, not months away, from making measurable and meaningful changes to our stay-at-home order.”

Polis’ office did not immediately respond to questions about how the Western states pact would guide Colorado’s reopening. Jesse Melgar, a spokesman for Newsom, wrote in a text message, “While each state is building a state-specific plan, states have agreed to the three principles outlined.”

Those principles are broad: Residents’ health comes first. Health outcomes and science, not politics, will guide governors’ decisions about modifying stay-at-home orders. And the states will be effective only if they work together.

Newsom said he was using insights from the other states to help craft guidelines for how to reopen businesses and schools, one of six criteria he laid out this month for lifting statewide shutdown measures. He plans to share more details Tuesday.

“You’ll see conversations that we’ve had with other governors where we have taken some of their counsel and advice and incorporated it,” Newsom said.

The pact is unlikely to lead to policies closing the borders and preventing travel between the five states. In recent weeks, states including Texas and Florida have set up border checkpoints where nonresident drivers were required to provide an address where they planned to shelter and promise to self-quarantine for 14 days. Legal experts have raised questions about the constitutionality of those practices.

“We have not had that conversation,” Newsom said Monday, though he added such checks were a possibility “if we’re at a different phase in this and there’s other concerns.”

Alexei Koseff is a San Francisco Chronicle staff writer. Email: alexei.koseff@sfchronicle.com Twitter: @akoseff