Blueberry Zucchini Bread Recipe with Lemon Sugar Top

By Aquarium Guides Editorial Team · Updated November 10, 2026

Last Updated: November 10, 2026

Blueberry zucchini bread is a summer quick bread built around two things that tend to arrive in abundance at the same time. The zucchini keeps the crumb soft, the blueberries burst into jammy pockets, and a crunchy lemon-sugar topping gives the loaf a bakery-style crust. This recipe makes one 9×5-inch loaf that slices cleanly and keeps well for several days.

What Makes This Loaf Different

Most zucchini bread leans on warm spices. This one skips cinnamon heavy flavors and focuses on fresh lemon zest and vanilla so the blueberries stay front and center. The batter uses buttermilk for a tender, slightly tangy crumb, and a portion of the sugar goes on top as a crisp crackly layer.

Ingredients

For the Bread

• 2 cups all-purpose flour
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 2 large eggs
• 3/4 cup granulated sugar
• 1/2 cup neutral oil such as canola
• 1/2 cup buttermilk
• 2 teaspoons vanilla extract
• Zest of 1 lemon
• 1 1/2 cups shredded zucchini (about 1 medium), squeezed gently
• 1 1/2 cups fresh or frozen blueberries
• 1 tablespoon flour for tossing the berries

For the Topping

• 2 tablespoons coarse or granulated sugar
• 1 teaspoon lemon zest

Instructions

1. Position a rack in the center of the oven and heat to 350°F. Grease a 9×5-inch loaf pan and line with parchment.
2. Rub the topping sugar and 1 teaspoon lemon zest together with your fingertips until fragrant. Set aside.
3. Whisk the flour, baking powder, baking soda, and salt in a bowl.
4. In a large bowl, whisk the eggs and granulated sugar for about 1 minute until slightly lighter. Whisk in the oil, buttermilk, vanilla, and the zest of one lemon.
5. Stir in the shredded zucchini.
6. Add the dry ingredients and fold until just combined.
7. Toss the blueberries with 1 tablespoon flour in a small bowl, then fold them into the batter gently. If using frozen berries, do not thaw them first.
8. Pour the batter into the pan and scatter the lemon sugar over the top.
9. Bake 60 to 70 minutes. The loaf is done when a skewer in the center comes out with no wet batter (a streak of blueberry jam is normal). Frozen berries may add 5 to 10 minutes.
10. Cool in the pan 20 minutes, then transfer to a wire rack. Let it cool nearly to room temperature before slicing so the berry pockets set.

Tips

• Frozen berries stay intact better. Fresh blueberries are fine, but frozen ones are less likely to burst when folded in.
• Toss in flour. A light flour coating helps suspend the berries in the batter rather than letting them settle at the bottom.
• Use fine shreds. The small holes of a box grater make zucchini that melts into the crumb.
• No buttermilk? Stir 1/2 tablespoon lemon juice into 1/2 cup milk and let it sit for 5 minutes.
• Watch the top. The sugar crust browns quickly. If it is dark before the center is done, tent with foil.

Variations

Blueberry Zucchini Muffins

Fill 12 lined muffin cups nearly to the top and bake at 400°F for 5 minutes, then reduce to 350°F for 15 to 18 more minutes.

Glazed Version

Whisk 3/4 cup powdered sugar with 2 to 3 tablespoons lemon juice and drizzle over the cooled loaf instead of using the sugar topping.

Almond Blueberry

Replace 1 teaspoon of the vanilla with 1/2 teaspoon almond extract and top the batter with sliced almonds.

Mixed Berry

Use half blueberries and half chopped strawberries or raspberries. Keep the total berry amount at 1 1/2 cups so the batter does not get too wet.

Ingredient Notes

Blueberries

Fresh and frozen berries both work. Wild blueberries are smaller and distribute more evenly through the batter, while large cultivated berries create bigger jammy pockets. If the berries are large, halve a few so each slice has fruit.

Lemon

One lemon is enough for the batter zest. Zest it before squeezing. If you also want to glaze the loaf, a second lemon covers the juice.

Oil

A neutral oil gives a moist crumb that stays soft for days. Melted butter can replace it at the same measurement and adds a richer flavor, though the crumb will firm a bit when chilled.

Zucchini

Aim for a medium zucchini with firm, glossy skin. Large, seedy ones are watery and need more squeezing. Shred finely so the zucchini blends in.

Troubleshooting

• Berries sank to the bottom: The batter was too thin or the berries were not coated in flour. Toss them in flour and fold gently.
• Wet streaks in the middle: Often jammy berry juice rather than raw batter. Test in an area without berries.
• Loaf is pale on top: Move the pan to a slightly higher rack for the last 10 minutes, or raise the oven temperature 15 degrees.
• Loaf cracked down the middle: This is normal for quick breads and creates a rustic look.

Serving Ideas

Slice thick and serve plain, or toast and spread with softened butter. A schmear of cream cheese complements the lemon. For brunch, serve slices with yogurt and extra berries.

Make-Ahead Notes

The loaf tastes better the next day, once the crumb has settled and the lemon has mellowed. Bake it the evening before serving and keep it wrapped. You can also mix the dry ingredients ahead and store them in a jar, then whisk the wet ingredients and fold everything together when you are ready to bake.

Storage

Store the cooled loaf wrapped at room temperature for up to 2 days. Because the berries and zucchini add moisture, refrigerate it after that for up to 5 days. The sugar crust will soften in storage, and a few minutes in a 300°F oven restores some of the crispness on a slice.

To freeze, slice the loaf, separate the slices with parchment, and store them in a freezer bag for up to 3 months. Thaw at room temperature or toast lightly.

FAQ

Why did my blueberries turn the batter greenish or gray?

Blueberry juice reacts with baking soda and can create a slightly green tint around the berries. It is harmless. Folding the berries in gently, and at the very end, reduces streaking.

Do I need to drain the zucchini?

Squeeze it lightly in a towel. You want to remove runoff but keep some natural moisture, since the loaf relies on it for tenderness.

Can I use yogurt instead of buttermilk?

Yes. Thin 1/2 cup plain yogurt with a splash of milk to pourable consistency and use it in the same amount.

How can I tell when it is done without cutting into it?

The top should spring back lightly when pressed and the edges should pull slightly from the pan. A skewer inserted at an angle into the center should come out without raw batter.

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