The large stumps scattered around your farm or the large hollow logs.

If you've unlocked the Secret Woods, there are six stumps that respawn every day

Ask Lewis.

Upgrade your axe and chop on stumps.

Secret woods. they give 12 hardwood each day, and a random chance of dropping mahogany seeds. I recommend planting the mahogany seeds until you get a tree, and chop them.

My wife showed me how she uses the quarry to plant a shit ton of mahogany seeds.

You need to upgrade your axe in order to harvest hardwood — big tree stumps will drop some when you chop them up. Theres a secret part of the woods near the wizard’s tower blocked by a fallen log that generates a couple of those tree stumps everyday. That’s your best resource

once you upgrade your axe sufficiently enough, go to the woods below your farm, past the lake and in the top left corner kill the log and go past it. theres a surprise for u

Assuming you didn't specilize for it.

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Then hardwood comes from stumps and logs. All the farms have some as one time harvests, the forest farm has daily hardwood stumps in addition to the temporary ones.

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Beyound that Cindersnap forest has a log blocking the path to the secret woods that has daily hardwood stumps you can havest every day. (don't foret to navigate the secret path down to the lower stumps.

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You need a copper axe to harvest stumps, and steel axe to harvest logs.

Upgrade your pickaxe and plant mahogany seeds to get the hardwood trees (they're yellow) or break tree stumps on your farm if you're playing 4 corner farm the top left square has a hard wood stump you can chop once a day

Get mahogany seeds, use tree fertilizer on them, chop them down, and repeat until I have more than enough hardwood.

Break any tree stumps on the farm.

Take the path down to the forest from the farm and go to the top left corner. There's a giant log you can break once your axe is upgraded high enough. That'll take you to the secret forest where tree stumps respawn every day. Breaking those gives you hardwood.

those big stumps or mahogany trees

Stare at Haley your favorite NPC.

I’ll see myself out.

The easiest path to hardwood is to choose the Forest Farm map at the start. Otherwise, once you pick up all the ones on your farm, the most reliable source is the Secret Forest. Yes, this takes a while and I'm 100% convinced that ConcernedApe set it up this way to bottleneck player progress from happening too quickly.

Not a lot but you can also get hardwood as drops in the mines. But yeah upgrade your axe to silver then cut down the log to the hidden forest and go there every day. Take your sword because there are also slimes.

Hidden Forest (after you get the iron axe), or play on the Forest Map for your farm and start harvesting soon as you get a copper axe.

Probably the stumps in the hidden forest area

Stumps in the hidden forest unless you have a farm layout that allows you to harvest it on your farm. If you have a bunch of trees you need to cut, you can go to the respecialization bear in the sewer and change your foraging to the 'get more wood' one and then 'trees can drop hardwood'. I can get that specialization and go around the cindersnap forrest and get like 60 hardwood. This does not work on mobile though as they're not in 1.4

https://stardewvalleywiki.com/Hardwood

If you upgrade your ax to gold I think you can break the big pieces of wood, there’s a secret forest with 6 wooden stumps to the right of the lady who sells rare goods on the weekends. Can get 12 a day :)

Careful not to be holding hardwood while attempting to talk to someone (except in multiplayer, then it's hilarious)... I'll escort myself out now.

Those big tree stumps on your farm give you hardwood. They can also be found in the secret woods where they refresh every day

I use the skill which gives me a chance to drop Hardwood and the skill which increases the amount of wood I get from trees (I think it applies to hardwood too, as I get about 13 to 15 hardwood from the woods each day). I save up seeds so that I can spam the bus stop (too lazy to go anywhere else) for a chopping spree.

Other than playing the forest farm, grinding out the secret woods is the best way. Sometimes barrels in the caverns will drop them, but that’s not necessarily worth counting on.

Have you saved up any seeds? With tree fertilizer they grow pretty quickly

You can cut down the trees in the forest to the south of the farm, they automatically regrow, so if you have the skill that's a good way, beyond that getting lucky and getting a mahogany seed and the secret forest are the only way I know how to get hardwood.

Ginger Island often has mahogany trees growing on it as well

Large stumps with a copper axe. Upgrade it again to steel and you can hit logs as well. Break the log to the top far left corner of Cindersap Forest. (directly below your farm!) to get access to the secret woods. Youll get 12 hardwood every day there from breaking the stumps.

If you dont have any upgrades yet hardwood appears in mines from breaking barrels/crates/chests

Follow up question: if you needed 100 hardwood, where would you get it from? Daily chopping in the secret woods is a chore and mining is rng but I can get other stuff done.

Search for big stumps and break them. You will need an upgraded axe

Hehe

https://stardewvalleywiki.com/Hardwood

Upgrade your axe a couple times, there's large stumps on your farm and to the left of the travelling cart.

When you upgraded your axe, there is a secret wood area you can access.

There are 6 stumps there that respawn every day.

You need to upgrade your ad and chop down the big stumps and logs in your area.

Upgrade your axe to cut the big log near the wizards tower and there are stumps which give hardwood and regrow everyday and if you have a forest farm on the west side there are those same logs

Given the time left, you won't be able to complete this even with the secret woods. Hardwood is really useful stuff! I suggest planting any mahogany seeds you find. They grow really slowly unless you put tree fertilizer on them.

There’s a giant tree trunk on the northwest side of cindersnap forest, you’ll find a solution if you break it! :)

You need a Steel Axe to obtain access to the Secret Woods

Secret woods has stumps that can be renewed every day. That’s 12 hardwood a day. You can also plant mahogany seeds to get hardwood, but those take a while to grow.

Stumps will reappear every day in the Secret Woods.