Every year around late January, my neighbor knocks on my door holding a mug of coffee and asks the same question: "So how many weeks until spring, you think?" She's not being lazy โ she's just tired of winter and wants a number she can mentally countdown with, not some vague "spring is coming soon" answer.
I used to just shrug and say "a couple months, I guess." Then one year I actually sat down and did the math properly, and honestly, it changed how I plan my whole late-winter routine โ from when I start seed trays indoors to when I finally put the snow shovel back in the garage.
So let's break this down the way I wish someone had explained it to me the first time.
First, Which "Spring" Are We Even Talking About?
This tripped me up for longer than I'd like to admit. There are actually two different "starts" of spring, and people mix them up constantly.
Meteorological spring starts on March 1st every single year. Meteorologists use this because it lines up neatly with the calendar months and makes weather record-keeping simpler.
Astronomical spring is tied to the spring equinox โ the exact moment the sun crosses the celestial equator. This date shifts a little each year, usually landing around March 19th, 20th, or 21st. I wrote a whole breakdown of why this date moves around on what the spring equinox actually is if you want the deeper explanation.
Most people (myself included) mean the astronomical one when they ask "how many weeks until spring," because that's the date that feels like the "official" seasonal switch.
So How Many Weeks Are We Talking About Right Now?
As I'm writing this, the next spring equinox lands around March 20th. Counting forward from today, that works out to roughly 36 weeks away.
I know that number will look completely different depending on when you're actually reading this article, which is exactly why I don't trust my own mental math for this anymore. I use a live countdown instead โ it updates automatically so I never have to recalculate by hand. That's honestly why I built a running spring countdown in the first place, because I got tired of doing the subtraction myself every few weeks.
How I Actually Calculate It (In Case You Want to Do It Yourself)
If you'd rather figure it out manually, here's the exact process I use:
Step 1: Find today's date.
Step 2: Look up this year's (or next year's, if you're past March) spring equinox date. It's not fixed โ it shifts slightly based on Earth's orbit, leap years, and time zones.
Step 3: Count the total days between the two dates. I usually just use a basic date calculator instead of counting on my fingers like some kind of caveman.
Step 4: Divide that number by 7. Whatever's left over is your "extra days" on top of the full weeks.
For example, 254 days divided by 7 gives you 36 weeks and 2 leftover days. That's it. No fancy formula needed.
A Mistake I Kept Making
For a couple of years, I kept calculating from March 1st instead of the actual equinox date, because I forgot meteorological spring existed. My countdown was always off by two to three weeks, and I'd get genuinely confused about why my "spring is basically here" feeling didn't match the actual weather outside.
Once I switched to counting toward the equinox instead, everything made a lot more sense โ especially living somewhere with a real winter, where the first week of March still feels brutally cold.
Why This Number Actually Matters (Beyond Just Curiosity)
I'm not just doing this math for fun. Knowing roughly how many weeks are left changes what I do around the house:
Gardening prep โ I start hardening off seedlings about 6-8 weeks before the last frost, which means the countdown directly tells me when to move plants outside. I go into more detail on timing in my spring gardening tips article.
Travel planning โ A lot of people book spring break trips based on this countdown too. If you're weighing options, I put together some ideas in what to do in Palm Springs.
Holiday planning โ Spring brings a cluster of holidays that sneak up fast once the countdown gets under 8 weeks. I keep a running list on the spring holidays page so nothing catches me off guard.
Signs the Countdown Is Actually Getting Real
Numbers on a screen are one thing, but I've learned to trust real-world clues too. Around the 4-6 week mark before the equinox, I start noticing:
Birds getting noticeably louder in the early morning
Daylight stretching noticeably later into the evening
That specific smell of thawing dirt after a warm afternoon
I wrote up a longer list of these in early signs that spring is coming, and honestly, checking those against the calendar countdown together is a pretty reliable combo.
Common Mistakes People Make With This Countdown
Assuming it's the same date every year. It's not โ the equinox can land on the 19th, 20th, or 21st depending on the year, so don't just reuse last year's date.
Forgetting time zones matter. The equinox happens at a specific moment in time (down to the minute), which technically means the date can differ depending on where you live. If you're curious about time-zone quirks like this, I touched on something similar in what time is it in Colorado Springs right now.
Confusing meteorological and astronomical spring. I made this mistake myself, and it threw off my countdown by weeks. If you want to check exactly when meteorological spring kicks in versus the equinox, I laid it all out on when is meteorological spring.
If you're ever unsure whether today counts as the actual first day, I also put together a quick reference on is today the first day of spring that settles the debate pretty fast.
Final Thought
At the end of the day, counting weeks until spring isn't really about the number itself โ it's about having something to look forward to when the days feel short and gray. My neighbor still asks me every week, and honestly, I don't mind checking anymore. It's become a small ritual, one that makes the last stretch of winter feel a little more bearable, one week at a time.