(CNN)The next wave of teacher walkouts and demonstrations is about to begin.
Public school educators in Arizona are scheduled to walk out Thursday, and some of their counterparts in Colorado will be at the state Capitol on Thursday and Friday in hopes of getting more funding from legislators.
Teachers in other states, including North Carolina, are either planning their own demonstrations or watching developments closely.
Educators in many states have been rising up against what they say is chronic underfunding, some of which dates to recession-era cuts. They've been energized by teachers in West Virginia, who landed a 5% pay raise last month after a nine-day strike, and walkouts in Oklahoma and Kentucky.
Arizona walkout set for Thursday
Arizona teachers have been agitating for weeks for better pay and more overall dollars for education -- and while the governor says he's pushing for a raise, educators say the plan isn't enough.
Members of the state's education association voted last week to walk out on Thursday. It's unclear how long the walkout will last. The Arizona Educators United grassroots coalition said 90 districts are expected to close Thursday, with between 30,000 and 50,000 educators making a stand.
Earlier this month, Gov. Doug Ducey announced a proposal to raise teachers' pay over the next three years, to what would amount to a 20% total raise by the 2020-2021 school year.
Ducey also proposed to restore education funding from recession-era cuts, by $371 million phased in over the next five years.
But Arizona Educators United had called for 20% pay raises for teachers by next school year, and to completely restore education funding to 2008 levels. The coalition and the Arizona Education Association say funding levels are $1 billion below that of 2008.
The average pay of Arizona teachers in 2017 -- $47,403 -- ranked 44th in the nation, and the state ranked 48th that year in per pupil spending, according to the National Education Association.
As in other states, teachers in Arizona say cuts to general education funding stops districts from keeping up with textbooks, supplies and technology. Low pay and funding also hurt teacher recruitment and retention, leading to teacher shortages and unwieldy class sizes, they say.
Ducey has said he still is pushing his plan to legislators, and on Monday he told Phoenix radio station KFYI that he didn't understand why teachers would walk out with that proposal in play.
"I don't know why the leaders would say that they're going to strike when we're delivering for the teachers on what we believe they deserve," Ducey told KFYI. "I can't understand that. But whatever the leaders in that movement are doing, I don't think they're really representing the teachers that are there for their kids every day, that are there for their parents."
Some schools may attempt to have classes Thursday, should they have enough teachers and staff willing to ignore the walkout, and substitutes. But dozens of school districts say they intend to close should the walkout happen as scheduled, CNN affiliates in Arizona have reported.
Colorado: Some schools closing Thursday and Friday
Last week, one Colorado school district closed as a few hundred educators went to the Capitol in Denver to rally for more funding. Two gatherings at the Capitol this week are expected to be much bigger.