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Quick Summary
- Start with your last frost date: Every other date in this guide is calculated from it.
- Seed starting needs a schedule, not a single day: Different plants need wildly different lead times indoors.
- Cool and warm season crops go in at different times: Mixing up the order is the most common spring mistake.
- Herbs split the same way: Cilantro and parsley go in early; basil waits for warm soil.
- Hydroponic growers get their own timing: Spring is a strong season to start or expand a system, largely independent of outdoor frost dates.
Spring planting fails for one of two reasons almost every time: something went in the ground too early and got hit by a late frost, or too late, losing weeks of a short window. Both mistakes come from the same root cause, treating spring as a single event instead of a sequence with an order to it.
This guide is the starting point for that sequence, whether you’re working a soil bed, a hydroponic system, or both. Everything below links out to a fuller breakdown, so treat this as the map and the linked guides as the detail.
Start with your last frost date
Every other date in this guide is calculated backward from one number. If you don’t already know your last frost date, find yours and learn how to actually use it, it’s a two-minute lookup and the guide covers why it’s a probability, not a hard deadline.
Once you have that date, seed starting, transplanting and direct sowing all become a matter of counting backward and forward from it, not guesswork.
Get your seed-starting schedule right
Different plants need wildly different lead times indoors. Onions need 10-12 weeks before your last frost; cucumbers need 3-4. Starting everything on the same day is the single most common spring mistake and it’s avoidable with a chart. The full seed starting timing guide breaks this down plant by plant, with adjustments for hydroponic germination speed.
Know what goes in first
Not every vegetable wants the same conditions. Cool season crops, peas, spinach, broccoli, kale, tolerate cold soil and light frost and some actually taste better for it. Warm season crops, tomatoes, peppers, cucumbers, beans, die at the first frost and shouldn’t go outside until the ground has properly warmed. The cool vs. warm season breakdown lays out the planting order so you’re not putting basil in the ground the same week as peas.
Pick your herbs deliberately
Herbs split along a similar line to vegetables. Cilantro, parsley and chives handle cold and bolt in summer heat, so spring is genuinely their season. Basil is the opposite, plant it too early and it stalls in cold soil rather than getting a head start. The spring herb guide covers timing for both soil and hydroponic growers, plus EC and pH targets if you’re growing them in a system.
If you’re growing hydroponically
Spring changes some things for a hydroponic setup and leaves others untouched. Increasing daylight and warmer ambient temperatures make it a genuinely good season to start or expand a system, here’s a full setup guide if you’re beginning from scratch, covering system types, first equipment and what to expect in the first two weeks.
Once your system is running, these are the vegetables worth prioritizing for a spring lineup, fast leafy greens for an early win, slower fruiting crops like tomatoes and peppers started early enough to be producing by summer.
If you’re running an aeroponic tower system specifically, the same seasonal logic applies, spring’s stable ambient temperature reduces strain on the misting cycle compared to summer heat.
A rough order to work through
- Look up your last frost date
- Start slow-germinating seeds indoors (onions, peppers, parsley) 8-12 weeks out
- Direct sow the hardiest cool season crops as soon as soil is workable
- Start warm season transplants indoors (tomatoes, basil) 6-8 weeks before last frost
- Transplant cool season starts and direct sow more cool crops around your last frost date
- Hold warm season transplants until 1-3 weeks after last frost, once nights stay warm
- If running hydroponically, start fast greens immediately and slower fruiting crops in parallel, regardless of outdoor frost timing
Every step above has its own detailed guide linked through this page. Start with your frost date, work through the sequence and the rest of spring planting stops being a scramble.
Editor’s Note: Parts of this guide were structured and optimized with the assistance of AI, then thoroughly reviewed, edited and expanded with first-hand growing experience by our author Raymond to ensure practical, real-world accuracy.
Frequently Asked Questions
What's the first thing I should do to plan a spring garden?
Look up your last frost date. Every other timing decision, seed starting, direct sowing, transplanting, is calculated backward or forward from that one number.
Does this guide apply to hydroponic growing too?
Yes. The frost-date and cool/warm season logic mostly applies to anything eventually grown outdoors, while indoor hydroponic systems get their own timing guidance for setup and crop selection.
What's the biggest mistake people make with spring planting?
Planting everything on the same day. Different crops need very different lead times and frost tolerances, spreading planting across 8-10 weeks avoids putting frost-sensitive plants out too early or cold-hardy ones out too late.
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