Pouring concrete for a patio takes planning, the right tools, and patience—but it is a project most homeowners can complete in a weekend with one or two helpers

A concrete patio begins with a solid foundation: a level base, proper drainage slope, and forms that hold the concrete in place while it sets. The actual pour takes a few hours, but the real work is in the prep. You will dig out the area, build wooden frames, mix or order concrete, pour it into the forms, smooth the surface, and then wait for it to cure before you can walk on it. The whole process from digging to a finished patio takes about two weeks, though you can use the surface after three to five days if you are careful.

Most homeowners can handle this project without special skills, but you do need to rent or borrow some equipment—a plate compactor, a concrete mixer or access to a ready-mix truck, a screed board, and a trowel. The biggest variables are the size of your patio and the weather on pour day. A small patio (under 100 square feet) can be mixed in bags, while anything larger should be ordered as ready-mix concrete delivered by truck. Cold weather slows curing and hot weather speeds it up, so timing matters.

Key Takeaways

  • Dig out the patio area 4 to 6 inches deep, compact the soil, and add a 4-inch gravel base for drainage before you build forms.
  • Build forms from 2-by-4 lumber, stake them level, and check that the surface will slope 1/8 inch per foot away from your house so water drains.
  • Order ready-mix concrete delivered to your site, or rent a mixer and buy bags if your patio is smaller than 100 square feet.
  • Pour concrete into the forms, work out air pockets with a shovel or vibrator, and smooth the surface with a screed board and trowel.
  • Let concrete cure for at least three days before walking on it and two weeks before sealing or heavy use.

Measure the area and mark out where the patio will go

Start by deciding on the size and shape of your patio. Most patios are rectangular, but you can build any shape you want. Measure the length and width, then mark the corners with stakes and string. Drive wooden stakes into the ground at each corner and run string between them so you can see the outline clearly. This is your chance to adjust the location before you dig—make sure the patio is at least 6 feet from your house foundation and that it does not sit directly under gutters or downspouts.

Check the ground for obstacles before you start digging. Call 811 (the national call-before-you-dig number) and have the utility company mark gas lines, water lines, and electrical lines. This is free and takes a few days, so do it early. Also look for tree roots, rocks, and soft spots in the soil. If the ground is very soft or wet, you may need to add extra gravel or wait for drier weather before you dig.

Dig out the patio base and prepare the ground

Dig out the entire patio area to a depth of 4 to 6 inches. A shovel works for small patios, but a rented excavator or skid-steer loader saves time and your back on anything larger than 200 square feet. Pile the soil to the side—you may be able to use it elsewhere in your yard. The goal is a level surface, so dig deeper in high spots and fill in low spots as you go. When you are done, the bottom of the hole should be roughly level across the whole patio.

Compact the soil with a hand tamper or rented plate compactor. Walk over the entire area with the compactor two or three times, overlapping each pass. Compacted soil prevents the concrete from settling unevenly later. Spread a 4-inch layer of gravel over the compacted soil and compact that as well. The gravel allows water to drain away from underneath the concrete, which prevents frost heave in cold climates and keeps the patio from cracking.

Build and level the wooden forms

Forms are the wooden frames that hold the concrete in place while it sets. Use 2-by-4 lumber—new or used boards work fine as long as they are straight. Cut the boards to length and lay them around the perimeter of the patio, inside your string outline. Drive wooden stakes into the ground on the outside of the forms every 4 feet, then nail or screw the forms to the stakes. The top of the form should be at the height you want the finished patio to be.

Level the forms carefully using a 4-foot level and check both directions—along the length of each board and across the width of the patio. The forms should slope slightly away from your house, about 1/8 inch per foot, so water runs off instead of pooling. If your patio is 12 feet wide, the far edge should be about 1.5 inches lower than the edge closest to your house. Adjust the stakes and forms until they are level in the right direction, then tighten all the fasteners so they do not shift when the concrete is poured.

Order concrete and plan the pour day

Calculate how much concrete you need by multiplying length times width times depth (in feet) and dividing by 27 to get cubic yards. A 12-by-16-foot patio that is 4 inches deep needs about 2.4 cubic yards. Add 10 percent extra for waste and uneven ground. For patios under 100 square feet, you can mix bags of concrete in a rented mixer. For anything larger, order ready-mix concrete delivered by truck.

Call the concrete supplier at least a few days ahead and schedule delivery for a day when the weather is dry and the temperature is between 50 and 85 degrees Fahrenheit. Concrete sets slower in cold weather and faster in hot weather, which affects how long you have to work. Tell the supplier the patio size and ask them to recommend a standard mix—most will suggest a 3,000 PSI (pounds per square inch) mix, which is strong enough for a residential patio. Arrange for helpers to be on site—you will need at least two people, ideally three or four, to pour and finish the concrete before it starts to set.

Pour the concrete and work out air pockets

When the concrete truck arrives, have the driver back as close to the patio as possible. Lay plywood on the ground to protect your lawn and to give the truck a stable surface. The concrete will come out of the chute as a thick, wet mix. Direct it into the forms, starting at one corner and working toward the other. Pour until the concrete is slightly higher than the top of the forms—you will screed it level in the next step.

As you pour, work the concrete with a shovel or a rented concrete vibrator to remove air pockets. Air pockets weaken the concrete and create holes in the finished surface. Push a shovel into the concrete and work it up and down, or run a vibrator along the inside of the forms. Do this as you pour, not after—it is much easier to remove air while the concrete is still flowing. Keep pouring and working until the entire patio is filled and the surface is roughly level with the top of the forms.

Screed and finish the surface

A screed board is a straight piece of wood or metal that you drag across the top of the forms to level the concrete. Use a 2-by-4 or a straight aluminum board. Place it across the top of the forms at one end of the patio and drag it toward you in a sawing motion, letting the ends of the board ride on the forms. This removes excess concrete and leaves a level surface. You may need to go over the same area two or three times. Fill any low spots with fresh concrete and screed again.

Once the surface is level, let it sit for 10 to 15 minutes until the water sheen disappears. Then smooth it with a trowel—a flat metal tool with a handle. Push the trowel across the surface at a slight angle, using long, overlapping strokes. This fills small holes and creates a smooth finish. If you want a non-slip surface for safety, do not trowel it smooth—instead, drag a broom across it lightly to create a textured finish. Broom the surface while the concrete is still slightly wet, not after it hardens.

Remove forms and let the concrete cure

Wait at least 24 hours before removing the forms. The concrete will be hard enough to hold its shape, but it is still curing inside. Carefully pry the forms away from the concrete using a pry bar. If the concrete is stuck, tap the forms gently with a hammer to loosen them. Once the forms are off, you can see the edges of the patio. If they are rough or crumbly, smooth them with a concrete file or rubbing stone.

Keep the concrete damp for the next week by misting it with water or covering it with plastic sheeting. This slows the curing process and makes the concrete stronger. You can walk on the patio after three to five days, but do not park a car on it or put heavy furniture on it for at least two weeks. The concrete reaches full strength after 28 days, but it will be strong enough for normal use much sooner. Once it is fully cured, you can seal it with a concrete sealer to protect it from stains and weathering.

Frequently Asked Questions

What if it rains right after I pour the concrete?

Light rain within the first few hours is usually fine—the concrete is still setting and the water helps it cure. Heavy rain or rain after the concrete has started to set can damage the surface and wash out the finish. If rain is forecast, cover the patio with plastic sheeting before you pour, and keep it covered until the concrete is hard enough that water will not damage it, usually 24 hours.

Can I pour concrete in cold weather?

Concrete sets much slower below 50 degrees Fahrenheit and may not set properly below 40 degrees. If you must pour in cold weather, use a concrete mix designed for cold weather and cover the patio with insulating blankets to keep it warm while it cures. It is better to wait for warmer weather if you can.

How do I fix cracks that appear after the concrete hardens?

Small hairline cracks are normal and do not affect the strength of the patio. Fill them with concrete crack filler or caulk. Larger cracks wider than 1/4 inch may indicate a problem with the base or drainage. Clean out the crack, fill it with concrete patching compound, and smooth it level with a putty knife.

Do I need to seal my concrete patio?

Sealing is not required, but it protects the concrete from stains, salt, and weathering. Wait at least 28 days after pouring before sealing. Use a concrete sealer made for outdoor patios and follow the manufacturer's instructions. Reapply sealer every two to three years depending on traffic and weather.

What is the best time of year to pour a concrete patio?

Spring and fall are ideal because the temperature is mild and the concrete cures evenly. Summer heat can cause the concrete to set too fast, and winter cold slows curing. Avoid pouring during heavy rain or when frost is forecast within 48 hours of the pour.