Picking The Right Time To Start Vegetable Seeds Indoors

When is the right time to start vegetable seeds indoors?

It is a question we get often to the blog this time of year. And a very good one at that!

Starting seeds at the wrong time can cause major problems for plants.

When started too early in the growing season, seedlings can quickly become too large for their cells. Way before they are ready for transplanting!

start vegetable seeds
A young seedling emerges through the soil.

And this can lead to a whole slew of issues before the young seedlings ever make it outdoors.

For starters, the roots of overgrown seedlings become tangled and matted.

This can make it hard to keep them hydrated as plants struggle to absorb water.

It also makes it difficult for the plants to soak up needed nutrients from the potting soil.

Have you ever watered a flat of seedlings only to watch the water simply pour through?

start vegetable seeds indoors
Seedlings that get too large can become root bound.

It is almost always a symptom of overgrown roots below the soil.

On the flip side, starting plants too close to planting time can cause big issues for plants as well.

Seedlings that haven’t had enough time to prepare for life outdoors can be in big danger at planting time.

Immature seedlings are easily damaged by cool evening temperatures or a light frost. They also easily fall prey to hard rains and winds.

Knowing When To Start Vegetable Seeds Indoors

So, just when is the best time to start vegetable seedlings?

start seeds indoors
Selecting the right time to start seeds indoors is a big key to vegetable gardening success.

For starters, it all begins with knowing your frost date. And from there, its all about using a simple count-back method.

A frost date is the average date of the last light freeze that most likely will occur in your area each spring.

Frost dates are published by a variety of resources and are quite easy to find. In addition, most seed companies have them posted on-line as well.

Local extension offices are a great resource too.

start vegetable seeds indoors
Healthy seedlings growing strong and true.

Once you know your frost date, you can employ a simple system called the count-back method.

It is an easy way to have your plants perfectly ready when it comes time to plant.

How To Start Vegetable Seeds Indoors Using The Count-Back Method

Begin by checking the back of your seed packets for recommended seed starting times.

Most seed packets list 4 to 6 weeks as a general rule of thumb. Always take the longer side of the recommendation to be safe.

Now, add on one more extra week to the longest time recommended.

This gives plants a little extra time to harden off in the last week or two before planting.

start vegetable seeds
This young seedling is far from ready for the great outdoors.

Hardening off is nothing more than letting young, tender seedlings get acclimated to the outside. (See : Why You Need To Harden-Off Plants)

Next, to know exactly when to plant seeds, simply count back from your frost date.

As an example, lets say we will be starting tomato seeds with a recommended time of 4 to 6 weeks on the seed packet.

And for the example, we will use June 1st as the frost date.

Using the count back method, we start by picking the longer time. In this case, it would be 6 weeks.

These tomato plants are just about ready to head outdoors at the 6 week mark.

Next, we add in the extra week for a total of 7 weeks. And then we count back from June 1st.

For this example, the seeds should be started April 13th for a June 1st planting.

Remember though to always check the recommended dates.

Some vegetables really do take longer to germinate and grow. While other seeds germinate and grow extremely fast.

Hot pepper seed varieties can take upwards of 8 to 10 weeks because of slower seed germination. But some cucumber varieties on the other hand can be ready in as little as 4 weeks.

Now it’s time to do a little homework – and get ready to start those seeds with confidence!

This Is My Garden is a garden website created by gardeners, publishing two articles every week, 52 weeks a year. This article may contain affiliate links.

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