Blue-Ribbon Veggies at the Arizona State Fair: Start Your Own Cool-Season Seed Trial This Week

The Arizona State Fair is in full swing in Phoenix, open Thursdays through Sundays through Nov. 1. Beyond the rides and the fair food, the fair's guide to 2026 competitive entries describes a horticulture division that includes single-stem roses, container gardens and home-grown vegetables, grown by Arizonans and judged for a ribbon.

Here's the fun part for desert families: while gardeners in most states are pulling up their last plants, the low desert is heading into its best growing season. The University of Arizona Cooperative Extension's Vegetable Planting Calendar for Maricopa County lists October and November seed-sowing for crops like beets, carrots, lettuce, spinach, broccoli, peas and radishes.

So this week, give your kids a question worth a ribbon: which vegetable seeds sprout fastest, and which ones will grow best in our desert winter?

What your kids will learn

Grades K–5

• Seeds come in all shapes and sizes, and each one holds a baby plant
• The plant life cycle: seed, sprout, plant, flower, fruit and back to seed
• Sorting vegetables into groups: roots, leaves and fruits
• Observing and recording how different seeds germinate

Grades 6–12

• Seed anatomy and dormancy
• Classifying vegetables by botanical family
• Designing a germination trial and comparing rates across varieties
• Open pollination, heredity and why seed saving protects genetic diversity

This week's activity: The cool-season seed sprint

Use any cool-season vegetable seeds you have (or pick up a few packets): try four kinds from the planting calendar, such as radish, lettuce, beet and carrot.

1. Sort and describe. Put each kind of seed in its own cup or muffin-tin cup. Kids compare size, shape and color with a magnifying glass and sketch each one.
2. Predict. Which will sprout first? Does a bigger seed sprout faster? Write the predictions down.
3. Set up the sprint. Place 10 seeds of each kind on its own damp (not dripping) paper towel, fold it over and slide it into a labeled zip-top bag. Keep all the bags together indoors, out of direct sun, so every seed gets the same conditions.
4. Check daily. Record the day each seed shows its first root. Younger kids can use tally marks; older kids can track days to sprout for every seed.
5. Crunch the numbers. After 10 days, count the sprouts. Older students calculate germination rate (sprouted ÷ planted × 100) for each kind and make a bar graph.
6. Plant the winners. Gently move sprouted seeds into pots or a garden bed and keep the soil moist. Families in Arizona's higher, colder country should keep this project indoors, since the planting calendar is written for the low desert.

Discussion question: fair judges look at size, shape, color and quality. What would your family's judging sheet for a winter carrot or head of lettuce look like? It's a great way to practice careful observation.

Take it further: a whole season of seeds in one box

Want a bigger trial than four packets? Our best-selling Heirloom Vegetable Seed Science Collection gives your kids 30 heirloom vegetable varieties to sort, sprout and compare, with a full curriculum to guide them.

• In the box: 30 individually packaged heirloom varieties (approximately 5,000 non-GMO, open-pollinated seeds), germination supplies and printed instructions
• Ready for Arizona's cool season: the collection includes Detroit Red Beets, Red Core Carrots, Mixed Green Lettuce, Long Standing Spinach and Green Sprouting Broccoli, all crops the Maricopa County calendar lists for fall sowing. Save warm-season varieties like Bantam Sweet Corn and Hales Best Cantaloupe for spring.
• Curriculum: 5 lessons for Grades K–5 or 6 lessons for Grades 6–12 (you choose at checkout), covering plant families, heredity, germination trials and seed saving; emailed after purchase
• Worksheets: a seed comparison and sorting sheet, a germination trial data chart, and a life cycle diagram or lab report template

Join the growing community

Every kit purchase includes an invitation to Aardvark's Seed Planting For Little Hands, our private group for families using our kits. Share your seed sprint results, post photos of your winter garden, and swap tips with young growers across Arizona, Arkansas, West Virginia and beyond. When families in colder states are snowed in, Arizona kids get to show off what's growing.

Ready to plant your own blue-ribbon garden?

Visit the fair if you can, then come home and start your seed trial while the planting window is wide open.

• Heirloom Vegetable Seed Science Collection – 30 Varieties, 5,000+ Seeds, with Curriculum & Worksheets: $85.95

Get the Heirloom Seed Science Collection

Sources: The Copper Courier, Arizona State Fair 2026 dates (Feb. 27, 2026); Arizona State Fair, "Finding Wonder: Your Guide to Competitive Entries at the 2026 Arizona State Fair" (Sept. 3, 2026); University of Arizona Cooperative Extension, Vegetable Planting Calendar for Maricopa County (az1005).