When Should You Start Seeds? A Simple Step-by-Step Guide for Gardeners
One of the most common questions I get is: “When do I start my seeds?”
The answer isn’t random, and it isn’t based on vibes 😉 It’s based on your frost dates, growing season length, and what the seed packet says.
Let’s break it down step by step so you can confidently plan your garden this year.
Step 1: Find Your First & Last Frost Dates
Before you plant anything, you need to know your:
Last spring frost date (when frost typically ends)
First fall frost date (when frost typically returns)
You can simply Google:
“Average last frost date near me”
“Average first frost date near me”
If you're gardening here in Arkansas like we are, those dates vary a bit by location — but they’re usually somewhere in:
Last frost: Late March to mid-April
First frost: Late October to early November
⚠️ Remember: These are averages, not guarantees.
Step 2: Calculate Your Growing Season Length
Once you have both frost dates, calculate how many days fall between them.
Example:
Last frost: April 1
First frost: November 1
That gives you about 214 frost-free days.
That number is your estimated growing season.
Why does this matter? Because every crop needs a certain number of days to mature.
Step 3: Read Your Seed Packet (Don’t Skip This!)
Your seed packet will tell you two very important things:
When to start seeds indoors
Days to maturity (or days to harvest)
Example:
A tomato seed packet might say:
Start indoors 6–8 weeks before last frost
Days to harvest: 75 days
Now we count backward.
If your last frost is April 1:
8 weeks before that is early February.
6 weeks before is mid-February.
So you would start those seeds sometime between early and mid-February.
That’s it. No guessing.
Step 4: Understanding “Days to Harvest”
This is where many gardeners get confused.
“Days to harvest” usually begins:
From transplant date (for crops started indoors), OR
From direct sowing date (for crops planted outside)
So let’s say:
You transplant tomatoes on April 1.
They take 75 days to mature.
You can expect harvest around mid-June.
Now compare that to your total growing season.
If you only have 90 frost-free days and a crop takes 100 days to mature… it won’t make it before frost unless:
You start it indoors early
You use season extension (hoop house, row cover, greenhouse)
Quick Example: Making Sure You Have Enough Time
Let’s say you want to grow pumpkins for fall.
Days to maturity: 110 days
First frost: October 31
Count backwards 110 days from October 31.
That tells you the latest you can safely plant and still harvest before frost hits.
Planning this way prevents heartbreak in October.
Warm Season vs Cool Season Crops
Not everything waits for last frost!
Cool crops (lettuce, broccoli, cabbage, peas) can often be planted before your last frost.
Warm crops (tomatoes, peppers, squash) must wait until frost danger has passed.
This is why knowing your frost dates is the foundation of everything.
Final Thoughts
Seed starting doesn’t have to feel overwhelming.
Here’s the simple formula:
Find your frost dates.
Calculate your growing season.
Read your seed packet.
Count backward (or forward) using the days listed.
Make sure your crop fits inside your frost-free window.
Once you understand this rhythm, you’ll never randomly start seeds again.
And remember… gardening is part science, part experience. Keep notes. Every year you’ll refine your timing just a little more 🌱
