Will heavy rain wash away grass seed after overseeding?
Heavy downpours can wash newly spread grass seed away before it has a chance to take root, turning a desired watering boost into a ruined lawn. This risk leaves first-time planters stuck guessing whether to risk the seed now or wait for better weather.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1Waiting a few days until cooler weather arrivesDid this help you?
- 2Delaying seeding to align with a late fall application planDid this help you?
- 3Getting the work done earlier or relying on aeration holes to keep seeds secureDid this help you?
- 4Waiting until after the rain system passes before putting down seedDid this help you?
- 5Rescheduling the soil drop or lawn serviceDid this help you?
- 6Proceeding with the service and waiting until weather clears to overseedDid this help you?
- 7Proceeding with both aeration and immediate seeding, accepting the rain as beneficial or mitigating potential seed washDid this help you?
- 8Holding off on planting due to high temperatures or heavy rain, using a drop seeder, raking for seed-to-soil contact, and using pellet covers.Did this help you?
- 9Allowing the company to only aerate and seed yourself after the rain stops, then fertilizing the following weekDid this help you?
- 10Proceeding with the appointment and manually reseeding any washed-out areas a few weeks laterDid this help you?
- 11Asking the company to guarantee the entire job if they insist on proceeding before the stormDid this help you?
- 12Waiting for a cold front to show upDid this help you?
- 13Checking ground temperatures before seedingDid this help you?
- 14Just overseeding and hoping for the bestDid this help you?
- 15Holding off on applying treatments until after the heavy rain passesDid this help you?
- 16Evaluating the rate and intensity of the rainfall rather than just the total accumulationDid this help you?
- 17Waiting out the storm before putting down grass seedDid this help you?
- 18Putting fertilizer into the aeration holes instead and using the rain to soak it inDid this help you?
- 19Waiting for the lawn to dry completely before mowingDid this help you?
- 20Setting the mower to the highest settingDid this help you?
- 21Using a reel mower instead of a rotary mowerDid this help you?
- 22Switching to dormant overseeding later in the year.Did this help you?
- 23Waiting to see if seeds wash away in pooling spotsDid this help you?
- 24Consulting online forums for advice and reassurance from other lawn care enthusiastsDid this help you?
- 25Using irrigation to keep the lawn watered despite high temperaturesDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“At the same time, rainy season is going to start in a couple weeks, so we want to give seed the best chance of taking root so it can enjoy all the free water.”source ↗
“laying it down and then asking it to survive its first week in the mid-90s sounds like a lot.”source ↗
“I have a landscaper coming this friday to aerate my lawn. But there is a nor'easter thats supposed to hit Friday evening into saturday/sunday. Should I reschedule this service?”source ↗
“I had my lawn aerated yesterday & was going to overseed today but there is going to be a storm starting tomorrow. Would this hurt the overseeding or do I need to get the seed down because I just aerated?”source ↗
“I was planing on over-seeding Saturday, but I worry if I do it then, it’ll wash away the next day in our now normal torrential downpours.”source ↗
“Was thinking of laying down some seed either later today or early Monday morning. We are expecting rain but it’s showing moderate or light intensity. Should I go ahead and seed or wait?”source ↗
“Is this gonna be great for germination or terrible?! Tomorrow will be a week and I’m gonna find out soon enough, kind of anxious was wondering what you guys thought”source ↗
“I am in SW Iowa zone 6a and wanted to take advantage of the free water while overseeding, but dont want it all to wash away.”source ↗
“Do I risk it or just wait a few days and do it after when it’s cooler? Any suggestion are helpful as this is my first time overseeding.”source ↗
“I know ideally I should wait until the grass is dry to avoid pulling roots and damaging the new grass, but the rain won’t stop. Thoughts on cutting the grass wet or waiting until it’s dry?”source ↗
“I've got an appointment to get my lawn aerated fertilized and overseeded the day before a nor'easter hits. 3+ inches of rain expected within the 3 days after. The company is pretty hesitant to move my appt until after the storm, saying the rain will be beneficial. Should I push harder to get it rescheduled?”source ↗
“Should I put seeds down before rain system moves in or wait out ?”source ↗
“I had some heavy rains after I overseeded a couple weeks ago and I definitely have spots it got washed away or drowned out”source ↗
“I had no idea and I also have aeration scheduled for Friday! Now I need to find an answer to this same question as I’m also in Long Island!”source ↗
“My lawn could benefit I think greatly having my seed start from deep in the aeration holes. Have not had aeration done before. So am not sure if the hole will fill back in with the rain. Im a novice at this and half knew the answer but figured id reach out to others who may have more expierence.”source ↗
“Do I wait again? I'm well aware that I'm running out of time, but I don't want to waste the seed and have a mud pit for a front yard until next fall.”source ↗
“Calendar wise I know it’s late but it was just mid 90’s for the past two weeks with little to no rain and this cold front just showed up.”source ↗
“It's been way too hot and humid to seed the last month.”source ↗
“I’m following this because I just scheduled aeration in southwest Ohio and they are planning mid October. That puts my overseed in mid October and I’m kinda nervous that’ll be too late.”source ↗
“My question is more about if I’d expect fert/pre-emergent to get washed away with 1-1.5 inches of water per day for a few days”source ↗
“If it is fine, at what point does it start becoming an issue?”source ↗
“Same question here actually. Didn’t aerate but was hoping to over seed before the rain. No sprinkler system as I have 2 acres so was counting on this rain, but now it’s really increased”source ↗
“Went to bed at midnight with all my reseeding stuff ready to go. Earliest chance of rain was forecasted for 5-6 pm, it's raining at 8 am. May wind up having to try dormant overseeding this year.”source ↗
“Just came here to post this same question so I am curious what others have to say. I live in 7A and aerated and seeded last week.”source ↗
Where this came up
People with this problem also raised
- 20When can I put weed killer down after overseeding?
- 38Can you plant grass seed late in the season after missing the window?
- 30How to keep heavy rain from washing away new grass seed
- 15How to fix a lawn after heavy rain washes away grass seed
- 13Does timing lawn aeration by a week or two actually matter?
- 20How to water new grass seed with a full-time job