Coroplast Signs: Sizes, Uses, Lifespan and Cost Guide

Quick answer: Coroplast signs are printed signs made from corrugated plastic, a lightweight, waterproof polypropylene sheet with a hollow fluted core. They're the standard material for yard signs, real estate signs, political signs and job-site signs because they're affordable, easy to stake in the ground and hold up to rain. Most coroplast signs last several months to about a year outdoors. At Ardor Printing in Snohomish, WA, we print custom coroplast yard signs in-house on a UV flatbed printer, single or double sided, and most orders are ready in 2 to 3 business days.

Key takeaways

• Coroplast is corrugated plastic. It's light, waterproof and cheap, which makes it ideal for short-term and seasonal signs.
• 18 x 24 inches is the most common yard sign size. 12 x 18 and 24 x 36 are also popular, and custom sizes and custom shapes are available.
• Double-sided printing doubles your visibility for signs that face traffic from both directions.
• Plan on months, not years, outdoors. For permanent signs, choose aluminum or Dibond instead.

What are coroplast signs made of?

Coroplast is a brand name that became the everyday word for corrugated plastic. The sheets are made of polypropylene, a tough plastic that doesn't absorb water. Two flat outer walls are joined by thin vertical ribs, called flutes, so the sheet looks like plastic cardboard when you see it from the edge. That design keeps the sign light and stiff at the same time.

Most yard signs are printed on 4 mm corrugated plastic. It's thick enough to stay flat in the wind but thin enough to cut quickly and ship cheaply. The flutes also do a job: a wire H-stake slides straight into them, so you can put a sign in the ground in seconds without any hardware.

What are coroplast signs used for?

If a sign needs to go in the grass, on a fence or at a job site for a limited time, coroplast is usually the right choice. Common uses include:

• Real estate signs: For Sale, Open House, Sold and directional arrow signs with brokerage branding.
• Political and campaign signs: Printed in volume and ready well before election day.
• Contractor job-site signs: "Another project by…" signs for roofers, painters, landscapers and builders.
• Event and directional signs: Parking, wayfinding and welcome signs for schools, churches, weddings and races.
• Safety and site signs: PPE, traffic-direction and warehouse signs. We've printed safety and directional signs for DTG Recycle.
• Promotions and store sales: Oversized, contour-cut coroplast signs, like the store closing signs we made for JR Furniture & Mattress.
• A-frame inserts: Replacement coroplast panels for Signicade sidewalk signs, which you can order online.

Coroplast sign sizes

Size (inches)	Best for
12 x 18	Directional arrows, small real estate riders, parking signs
18 x 24	The standard yard sign for campaigns, contractors and real estate
24 x 36	Signs that need to be read from the street or a parking lot
Custom sizes up to full sheets	Job-site banners, store promotions and event backdrops
Custom shapes	Contour-cut logos, arrows, houses and eye-catching sale signs

We cut custom shapes on our digital cutter, so your sign doesn't have to be a rectangle. A sign shaped like a house, a truck or your logo stands out in a row of standard yard signs.

Single-sided or double-sided?

Single-sided coroplast signs work well against a wall, fence or window. Double-sided printing is the better choice for yard signs along a road, because drivers see your message coming and going. The cost difference is small compared with the extra exposure, which is why most campaign and real estate signs are printed on both sides.

How long do coroplast signs last outside?

Printed coroplast is waterproof, so Seattle rain isn't the problem. Sun and wind are. In direct sun and full weather, most coroplast signs last about 6 to 12 months, and they often last longer in shaded or covered spots. UV-cured inks help colors hold up in the sun, and printing with the flutes running vertically lets H-stakes slide in straight and hold tight.

To get the most life out of your signs:

• Use H-stakes pushed fully into the flutes, and set stakes deep in soft ground.
• Use grommets or zip-tie holes when mounting to fences, so the wind can't tear the corners.
• Store reusable signs flat and out of the sun between events.

If you need a sign to last for years, like a permanent business or parking sign, choose aluminum or Dibond. See our custom signs page for rigid, long-term options.

Coroplast vs. other sign materials

Material	Weight and feel	Typical use	Outdoor life
Coroplast (corrugated plastic)	Very light, flexible	Yard signs, events, job sites	Short term: months to about a year
Aluminum / Dibond	Rigid, heavier	Storefront, parking and post-mounted signs	Long term: years
PVC board	Rigid, smooth	Indoor signs, displays, lobby signs	Best indoors
Vinyl banner	Flexible, rolls up	Fences, storefronts, events	Medium term with hems and grommets

How much do custom coroplast signs cost?

Coroplast is one of the most affordable sign materials, and the price per sign drops as your quantity goes up. Four things set your price:

1. Size: Bigger signs use more material and ink.
2. Quantity: Setup is shared across the order, so 50 signs cost much less each than 5.
3. Single or double sided: Printing both sides adds a small amount per sign.
4. Extras: Custom shapes, H-stakes, grommets and design time.

Ardor quotes every order for free. Send your size, quantity and artwork, or ask our designers to lay out the sign for you.

How to order printed coroplast signs from Ardor

1. Request a quote with your size, quantity, and whether you need single or double sided signs and H-stakes.
2. Approve your digital proof. Our in-house designers can create the artwork or check your files.
3. We print and cut in-house. Print projects require a 50% deposit before printing, and most orders are ready in 2 to 3 business days.
4. Pick up in Snohomish or ask about delivery for larger orders.

Need something bigger than a yard sign? We also print vinyl and mesh banners and A-frame sidewalk signs, and we can match your yard signs to your vehicle graphics.

Frequently asked questions about coroplast signs

Get a free coroplast sign quote

Ardor Printing prints custom coroplast signs for real estate agents, campaigns, contractors, schools and businesses across Snohomish County, Seattle and the Eastside. Call (425) 629-0796 or request a free quote.

About the author: Dayne Remlinger founded Ardor Printing in 2012. His team has completed more than 25,000 projects, from yard signs to fleet wraps, from its shop at 12531 Old Snohomish Monroe Rd, Snohomish, WA 98290.