Spring is the season most outdoor growers circle on the calendar. Days are getting longer, soil is warming and the long summer ahead gives photoperiod plants months to build size before they flower. The catch is that the seeds you pick in March and April decide how the whole season goes. A strain that suits a long, dry California summer can struggle in a short, wet Great Lakes season. This guide walks through how to choose spring seeds for outdoor growing, when to start them and how to match genetics to your local weather. Everything here is for adults 21 and older who live where home growing is legal.

Why spring is the best time to start an outdoor grow

Cannabis plants that are photoperiod types stay in vegetative growth while nights are short. Around the summer solstice the nights start to lengthen, and by late July or August most photoperiod plants begin to flower. If you plant in spring, your plants get eight to twelve weeks or more of vegetative growth, and that long run is where big outdoor plants come from.

Autoflowers do not care about day length, so they can be planted any time the weather is warm. In spring, they give you a chance at an early harvest in June or July, then a second autoflower run before fall. That makes spring the one season where you can stack both seed types in the same garden.

Photoperiod or autoflower for a spring start

Photoperiod feminized seeds

Feminized photoperiod seeds are the classic spring choice. They grow large when started early, and every healthy plant should produce flowers. Expect most of them to finish somewhere between late September and late October, depending on genetics and latitude. Long flowering sativa leaning plants may run into November, which is too late for many northern gardens.

Autoflowering seeds

Autoflowers usually finish in roughly ten to twelve weeks from sprout, though some take longer. They stay smaller, which helps if you need a discreet garden or have a short fence. In spring, start them after your last frost so cold nights do not stall them. You can browse options in our autoflower seeds collection.

Mixing both

Many home growers plant one or two photoperiod plants for the big fall harvest and a couple of autoflowers for an early summer harvest. Check your state plant limit first, because every plant in the ground counts toward it.

Match seeds to your climate

The single most important factor when picking spring seeds is how your fall weather behaves.

• Short season and early frost. Northern states and high elevation gardens often see frost in early October. Choose fast finishing indica leaning genetics or autoflowers.
• Wet fall. The Pacific Northwest, the Northeast and the Great Lakes often get rain in late September and October. Pick seeds bred for airy buds and mold tolerance. See our mold resistant cannabis strains for ideas.
• Long dry season. Much of California, the Southwest and parts of the Mountain West can handle longer flowering plants because fall stays dry and warm.
• Hot humid summer. The Southeast can grow huge plants, but humidity raises mold and pest pressure. Favor genetics with open structure.

Our outdoor seeds collection groups strains that tend to handle open air growing well.

When to start seeds in spring

A common plan is to germinate indoors about four to six weeks before your last frost date, then move plants outside once night temperatures stay above about 50°F. Starting indoors protects tiny seedlings from slugs, birds and cold snaps. Planting straight into the ground works too, but wait until soil has warmed.

Region	Indoor start	Move outside
Southwest and Southern California	Late February to March	March to April
Mid Atlantic and Midwest	Late March to April	Mid May
Northeast and Great Lakes	April	Late May to early June
Pacific Northwest	April	Late May to June

These are rough windows. Your local frost date and weather forecast always win.

How to harden off spring seedlings

Indoor seedlings are soft. A sudden move into full sun and wind can scorch leaves and stall growth for a week or more. Harden them off over seven to ten days.

1. Start with an hour or two in shade outdoors.
2. Add an hour or two each day and move them into morning sun.
3. Leave them out overnight once nights are mild.
4. Transplant on a cloudy day or in the evening, and water well.

Prepare the spot before planting

Pick the sunniest spot you can legally use, ideally with six to eight hours or more of direct sun. Mix compost into native soil or build a raised bed or large fabric pot. Outdoor cannabis likes loose, well drained soil that holds some moisture. Mulch helps keep roots cool and cuts down on watering. Many states require plants to be out of public view, so think about fences and screening before you dig.

Common spring planting mistakes

• Planting too early. A cold night can stunt young plants, and photoperiod plants set outside under short spring days may start to flower early, then revert. That process, sometimes called reveg, costs weeks.
• Choosing the wrong flowering time. A strain that finishes in November will not work where frost comes in early October.
• Ignoring pests. Slugs, cutworms and rabbits love seedlings. Use collars and barriers.
• Overwatering in cool weather. Cool soil dries slowly. Let the top inch dry before watering again.

A simple spring seed checklist

Before you order, write down your last frost date, your first fall frost date and how rainy your fall tends to be. Count how many plants your state allows. Decide how tall plants can get before neighbors notice. Then shortlist two or three strains that fit those numbers. Read each strain page for flowering time and height, and treat those numbers as estimates.

If you want more help, our outdoor seeds collection and the beginner seeds range are good starting points. Beginner friendly genetics tend to forgive small mistakes with watering and feeding, which matters in a first outdoor season.

Seed storage before spring

If you buy seeds over the winter, keep them in a cool, dark, dry place until spring. A sealed container in the fridge works well. Let it come to room temperature before opening so condensation does not form on the seeds. Good storage keeps germination rates strong when planting day finally arrives.

Grow legally and responsibly

Home cultivation is only legal in some states, and each state sets its own plant limits, locking rules and rules about whether plants can be visible from a public place. You must be 21 or older to buy seeds from Kind Seed Co, and you should grow only where your state and city allow it. Check your state rules in our guide to the legal requirements for growing weed plants in your state before you plant. Federal treatment of cannabis seeds is also changing, so read our December 11 2026 seed rule explainer before you order. Keep plants and harvested flower locked away from children, pets and visitors, and never drive after using cannabis. This article is general information about gardening. It is not legal advice and it is not medical advice.

Frequently asked questions

When should I plant cannabis seeds outdoors in spring?

Most growers start seeds indoors four to six weeks before their last frost and move plants outside once nights stay above about 50°F. In many states that means mid May to early June.

Are autoflowers or photoperiods better for spring?

Both work. Photoperiods get bigger when started in spring and finish in fall. Autoflowers finish faster and can give you an early summer harvest. Many growers plant a mix within their legal plant count.

What strains handle a short northern season?

Look for fast finishing indica leaning genetics or autoflowers with a listed finish in late September. Check each strain page, and treat flowering times as estimates.

Can I plant seeds straight into the ground?

Yes, once the soil is warm and frost risk has passed. Protect seedlings from slugs and birds with collars or covers.

Ready to start

Browse the full range in the Kind Seed Co shop or go straight to outdoor seeds. Kind Seed Co sells only to adults 21 and older. Always follow the home grow laws where you live.