Sod gives you an instant lawn with few weeds, controls erosion on slopes and can be laid any time in the growing season, but it costs more, comes in fewer grass choices and needs a lot of water at first. Seed costs less, offers a larger choice of grasses and grows in the conditions it will have to live in, but it is slow, timing is critical, and rain can wash it away. University of Maryland Extension says the choice comes down to budget, labor, availability of materials and patience for the time it takes to establish. University of Illinois Extension adds that, assuming planting is done properly, the end result of a healthy lawn should be the same either way.
To plan either route, use the Grass Seed Calculator for pounds of seed or the Sod Calculator for rolls and pallets, and enter your own local prices to compare the cost.
Sod vs seed at a glance
| Factor | Seed | Sod |
|---|---|---|
| Cost | Lower cost per square foot | Typically higher cost. A Colorado State Extension horticulturist says sod gives an “instant” lawn but costs significantly more. |
| Time to a usable lawn | Slow stand development. Mowing typically 4 to 6 weeks after seeding, and keep traffic off for at least a month after germination or until mowed twice | An “instant lawn” that may be trafficked soon after planting. Ideally begins to root within 14 days, and roots are typically established in 2 to 3 weeks |
| Planting window | Timing is critical. Late summer to early fall is ideal for cool-season grass | Any time during the growing season, if the ground is not frozen and water is available |
| Choice of grasses | Larger selection of species and cultivars | Choice of species is limited |
| Slopes and erosion | Rain or irrigation can wash seed away, and there is a risk of erosion during germination | Reduces dust, mud and erosion, and immediately reduces erosion risk after installation |
| Weeds | Weeds will be a problem | Good sod is weed-free, though uncertified sod could contain weeds or undesirable grasses |
| Shade | Shade-adapted mixes are available | Not produced in a shaded environment |
| Watering | Initial watering is critical | A large volume of water is needed at first |
Sources for the table are University of Maryland Extension, University of Illinois Extension and Kansas State University, listed at the end. The Colorado State quote comes from a LawnStarter article that quotes Alison O’Connor, a horticulture professor with CSU Extension.
When to choose sod
- You need cover quickly, for example to stop mud and dust around a new house.
- You have a slope or an erosion problem. Seed can wash away, while sod holds the soil.
- Weeds are a worry. Good sod is weed-free, whereas weeds will be a problem in a seeded lawn.
- You are planting outside the ideal seeding window. University of Maryland Extension says laying sod in spring is easier than getting seed to germinate and establish.
- You have the budget and uniform irrigation. Colorado State Extension describes sod as a good option for people with the economic resources, uniform irrigation and a wish for an “instant” effect.
When to choose seed
- Cost is the priority, especially for a large area.
- You want a particular species or cultivar. Kansas State University says that if the species you want is not sold as sod, seeding is the only way to establish it.
- The area is shaded. Sod is not grown in the shade, so seed lets you choose a mix suited to your light.
- The sod farm’s soil is very different from yours. Kansas State notes that incompatibility between sod-farm soil and your soil can make sod perform poorly. Seed develops in the soil it will live in.
- You are filling thin spots in an existing lawn. See how to overseed a lawn.
Comparing the cost
Prices for sod and seed vary a lot by region, grass type, season and whether you hire an installer, so we do not quote dollar figures here. Extension sources agree on the direction: seed is cheaper per square foot and sod is more expensive. To compare for your own yard, work out the area, then enter your local quotes in both calculators:
- In the Sod Calculator, enter the area and your price to see the number of rolls or pallets, a waste allowance and a total.
- In the Grass Seed Calculator, choose your grass and enter the price per pound for pounds of seed, bags and total cost.
- Add the other costs both routes share: topsoil, starter fertilizer, water and mowing, and any erosion control for seed on a slope. Use the Topsoil Calculator for soil.
Warm-season grasses
The choice is different for warm-season lawns. University of Maryland Extension says warm-season turfgrasses are usually sold as plugs (zoysia) or sprigs (bermudagrass), though they may occasionally be available as seed or sod. It does not recommend starting zoysia from seed because of high cost, limited availability and unreliable germination. Check which forms are sold in your area before you decide.
Preparation is the same for both
Sod and seed both need good soil. For the depth of topsoil a new lawn typically needs, which Penn State Extension puts at a minimum of 4 to 6 inches once settled, see how much topsoil do I need. Kansas State University says to plant sod in a brick-like pattern with the edges tightly butted, and not to stretch it, because it will shrink as it dries and let weeds in between pieces. University of Maryland Extension warns that sod that gets too dry before planting may die.
What to do after planting
- Seed: keep the seedbed moist (see how often to water grass seed), expect germination in days to weeks (see how long grass seed takes to germinate), and do the first cut when the seedlings are about 3 inches tall (see when to mow new grass).
- Sod: water it well from the start (see how often to water new sod), check rooting by tugging on a corner after about 2 weeks, and mow once it is rooted. See how to lay sod for the full steps.
Common mistakes
- Seeding at the wrong time of year, or letting the seedbed dry out.
- Walking on a new seeded lawn too soon.
- Laying sod on poorly prepared soil.
- Stretching sod or leaving gaps between pieces.
- Letting sod dry out before it is laid.
- Choosing sod for a shaded area where the sod grass will not thrive.
Common questions
Is sod better than seed?
Neither is better in every case. Sod wins on speed, weed control and erosion control. Seed wins on cost, variety and shade. University of Illinois Extension says that with proper planting, the end result of a healthy lawn should be the same.
Is sod cheaper than seed?
No. Seed is cheaper per square foot, and sod typically costs more.
How long does sod take to root compared with seed?
Sod ideally begins to root within 14 days and is typically established in 2 to 3 weeks. Seed has to germinate first, and the first mowing is typically 4 to 6 weeks after seeding.
What is better for a slope?
Sod, because it reduces erosion right after installation, while seed can wash away in rain or irrigation.
Is sod or seed better for shade?
Seed, because sod is not produced in a shaded environment. Choose a shade-adapted seed mix.
When can I lay sod?
Any time during the growing season, provided the ground is not frozen and water is available.
When is the best time to plant grass seed?
For cool-season grass, late summer to early fall. See when to plant grass seed.
Bottom line
Choose sod for speed, weed control, slopes and bad timing, if you can afford it and water it. Choose seed for lower cost, a specific grass, shade or a big area, if you can wait and keep off the lawn. Then work out your quantities and costs with the Sod Calculator and the Grass Seed Calculator.
Time to establish and the best choice vary by grass species, region, season and site. Use your local extension office for advice specific to your area.