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treated lumber for raised garden beds #925401

Asked March 04, 2026, 10:47 AM EST

Is it safe to use treated lumber to construct raised beds for vegetables? I understand they no longer use arsenic but is the current chemical safe? Thanks for your help.

Montezuma County Colorado

Expert Response

Hi Ann,

You're right that the chemicals in pressure treated wood have changed to not include arsenic but this is a bit of a complicated question because all wood will eventually rot and to some degree could leach chemicals if they are treated. The risk of treated wood is generally considered minimal but with all things, not zero. It is not advisable to use creosote coated railroad ties. While more expensive, using naturally rot resistant wood like cedar, redwood or juniper is safe and may be the best option if you have concerns. 

Here are a few resources to help you make a decision on which type of raised bed material could be best for you. 

 https://extension.oregonstate.edu/gardening/soil-compost/pressure-treated-wood-raised-bed-construction-willamette-valley

https://extension.sdstate.edu/sites/default/files/2024-07/P-00301.pdf

https://extension.psu.edu/how-to-construct-a-raised-bed-in-the-garden


Feel free to reach out directly if you have additional questions!

Best,

Emily Lockard

CSU Extension Montezuma County

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An Ask Extension Expert Replied March 09, 2026, 2:36 PM EDT

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