Rats

i would like opinion can a rat climb up and iron a metal garbage dumpster.Thanks

Into not iron

Probably jump into the side openings.

Rats are acrobats and can jump higher than most think. Could they jump directly into a dumpster? Doubtful, but if they have something to assist them, I'd bet on the rat.

Check the base, over here they have a drainage hole in the bases that should have a plastic plug/bung, this frequently gets removed or lost and can allow rats to get into them where they then settle down and feel safe to relax and eat at their leisure. We have had large problems due to the missing plugs. Some have a small diameter hole that was originally rat proof but rusting causes the hole to enlarge.
I have also had problems where rats climb up items trailing out of the bin, and climbing up items close to the bin from where they jump onto or in.. A record last year was 7 rats that I despatched in a wheelie bin that had climbed up a chain used to raise and lower a roller door.

I hope not. I've got a dumpster outside all year long. On the bright side, they would get shipped to the dump.