When should you plant your garden?

When do you start seeds?

Why does your neighbor plant weeks before you — even though you live in the same state?

The answer lies in USDA hardiness zones, frost dates, and microclimates — and understanding them can make the difference between thriving plants and frost damage.

Let’s break it down clearly and practically.

Check out this video:

The United States Department of Agriculture (USDA) created the Hardiness Zone Map to help gardeners understand what plants can survive winter in their area.

Zones are based on average annual minimum winter temperatures.

Each zone is divided into:

• A (colder half)

• B (warmer half)

For example:

• Zone 6B is warmer than 6A

• Zone 5B is warmer than 5A

You can find your exact zone by entering your ZIP code on the USDA website.

But here’s what most people don’t realize…

Your Microclimate Matters More Than the Map

At our Utah homestead, we’re technically Zone 6B.

But because we sit in a cold pocket high on a hill, we treat it like Zone 5B — sometimes even lower.

Cold air settles.

Wind exposure changes soil temperature.
Elevation shifts frost timing.

Because of this, we don’t plant until after Mother’s Day to avoid late spring frosts.

If you’ve ever:

• Lost tomatoes to a surprise frost

• Had peppers stall out

• Watched seedlings struggle

…your microclimate is probably the reason.

Go with local experience over the national map.

Your gardening calendar revolves around two dates:

Last Spring Frost

The average date when freezing temperatures stop in spring.

First Fall Frost

The average date when freezing temperatures return in fall.

Your goal:

• Start seeds early enough to transplant after last frost
• Harvest before first fall frost
• Remove irrigation systems (like ollas) before hard freeze

When Should You Start Seeds?

Here are common timing examples based on last frost date:

• Roma Tomatoes → Start 6–8 weeks before last frost

• Tabasco Peppers → Start 8–12 weeks before last frost

• Lettuce → 4–6 weeks

• Brassicas → 6–8 weeks

• Squash & cucumbers → Often direct sow after frost

The key principle:

Count backward from your last frost date.

That ensures plants are strong and ready to transplant at the right time.

Who Has the Best Local Information?

If you want accurate, hyper-local planting advice, check with:

• County extension office

• Master gardener programs

• Local nursery

• Farmers market growers

• Experienced gardening neighbors

They understand your true frost risks and microclimates.

If you garden using The Automatic Olla Watering System, timing becomes even more important.

Ollas work by slowly releasing water directly to plant roots underground. They:

• Reduce water waste

• Prevent overwatering

• Encourage deep root growth

• Improve drought resilience

But they must be handled seasonally.

• Install when soil is workable in spring
• Remove before hard ground freeze in fall
• Store dry over winter

Freezing water inside clay can crack them — so don’t leave them buried through winter in cold climates.

If you want to see the system we use:

https://thethirstyearth.com/products/the-automatic-olla-watering-system-for-your-garden

For dry climates, busy families, or homesteads conserving water, ollas are one of the most efficient irrigation methods available.

If you have questions about:

• Your planting schedule

• Frost timing

• Seed starting

• Olla irrigation

Reach out — we’re happy to help.

Summer is closer than it feels 🌱☀️

Space the terracotta cups evenly across the bed and use a garden auger drill bit to dig clean holes.

Each olla gets buried so the rim stays above soil level. This keeps dirt out while allowing water to slowly seep through the clay walls into the root zone.

Then assemble:

• Cap nuts

• Fittings

• Tubing

The system connects all the ollas to a single water source — meaning the entire bed waters itself automatically.

Once filled, the system keeps soil perfectly moist for days at a time.

No timers.
No electricity.
No drip lines to clog.

Just gravity and terracotta doing what they do best.