March is a fantastic time to refresh your science lessons with exciting, hands-on STEM activities that get kids thinking, building, and experimenting. With the change of seasons, there’s so much to explore—weather patterns, plant growth, and even fun math and science celebrations like Pi Day (March 14th) and World Water Day (March 22nd).

If you’re looking for easy, engaging STEM lessons that your students will love, I’ve got you covered! Below are five fun activities that tie into real-world science and keep learning exciting this March.

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Investigating the Water Cycle (World Water Day – March 22nd)

🌎 Why This Matters: Water is one of our most precious resources, and World Water Day is the perfect opportunity to teach students about the importance of conservation and the water cycle.

💡 Activity: Make a Mini Water Cycle in a Bag

• Materials: Resealable plastic bag, water, blue food coloring, permanent marker, tape
• Directions: Draw clouds, the sun, and waves on the bag. Fill it with a small amount of water, seal it, and tape it to a sunny window. Over time, students will observe condensation, evaporation, and precipitation in action!
• STEM Connection: This simple experiment helps students visualize how water moves through our environment.

🔎 Looking for more STEM lessons on physical science and take it a step further? Check out my Physical Science Vocabulary Activities and Worksheets to reinforce key concepts!

📖 Book Tie-In: A Drop Around the World by Barbara McKinney follows a single drop of water as it travels the globe, making it a perfect read-aloud for this lesson.

Growing Spring Plants: A Seed Germination Experiment

🌱 Why This Matters: Spring is the season of growth, making it the perfect time for students to observe how plants develop from tiny seeds to thriving greenery.

💡 Activity: Grow Beans in a Jar

• Materials: Clear plastic cup or jar, paper towels, water, dry beans (lima beans or kidney beans work well)
• Directions: Dampen a paper towel, place it inside the jar, and tuck a few beans between the towel and the glass. Over a few days, students will see the roots and stems emerge.
• STEM Connection: This hands-on experiment ties into lessons on plant life cycles, photosynthesis, and environmental science.

🌱 Pair this with the Engineering Design Process Worksheets and STEM Activities to learn all about the Engineering Design Process!

📖 Book Tie-In: How a Seed Grows by Helene J. Jordan is a wonderful read for younger students to learn about the plant life cycle in an easy-to-understand way.

Celebrate Pi Day (March 14th ) with a Math & Science Crossover

🔢 Why This Matters: Pi is one of the most fascinating numbers in math, and it plays a huge role in science and engineering! Pi Day is a great time to show students real-world applications of math.

💡 Activity: Measure the Circumference of Circular Objects

• Materials: String, ruler, and various round objects (plates, lids, cans, etc.)
• Directions: Have students wrap a string around different objects to measure the circumference, then divide it by the diameter to see how close they get to π (3.14).
• STEM Connection: This hands-on exploration reinforces measurement skills and the importance of Pi in science and engineering.

📖 Book Tie-In: Sir Cumference and the Dragon of Pi by Cindy Neuschwander is a fun, medieval-themed math story that introduces the concept of Pi in a way that kids will love.

Spring Weather Watch: Charting March Weather Patterns

⛅ Why This Matters: Weather is one of the most observable and relatable science topics for students. Tracking weather over time helps them recognize patterns and understand how seasons change.

💡 Activity: Create a Classroom Weather Station

• Materials: Thermometer, rain gauge, wind vane (DIY with straws and paper), cloud observation chart
• Directions: Assign students daily weather tracking roles and record temperature, precipitation, and cloud types for a month.
• STEM Connection: This activity encourages data collection, observation, and critical thinking.

☀️ Need more weather-focused STEM lessons? My Preschool Weather Unit introduces young learners to weather concepts in a fun, interactive way!

📖 Book Tie-In: What Will the Weather Be? by Lynda DeWitt explains basic weather concepts in a simple and engaging way.

Rainbow Science for St. Patrick’s Day

🌈 Why This Matters: Kids love a good St. Patrick’s Day activity, and this simple color experiment ties in science while keeping things festive.

💡 Activity: Milk & Food Coloring Experiment

• Materials: Whole milk, food coloring, dish soap, cotton swabs
• Directions: Pour a thin layer of milk into a shallow dish. Add a few drops of food coloring. Dip a cotton swab in dish soap and touch it to the milk—watch the colors swirl!
• STEM Connection: This experiment is a great way to introduce the concept of surface tension.

🌈 Add a festive literacy tie-in with my March Color by Code: Frequently Confused Words – St. Patrick’s Day Theme—a fun way to reinforce grammar concepts alongside STEM lessons. Also, make sure to check out St Patrick’s Day Activities for School blog post.

📖 Book Tie-In: How the Crayons Saved the Rainbow by Monica Sweeney is a sweet story that ties in beautifully with this lesson.

March is the perfect time to bring STEM lessons to life with engaging, hands-on activities. Whether your students are exploring the water cycle, growing plants, celebrating Pi Day, tracking the weather, or experimenting with colors, these lessons will spark curiosity and make learning memorable.

Looking for even more STEM lessons? Check out my full collection on Teachers Pay Teachers!

What are your favorite STEM lessons and activities for March? Let’s chat in the comments!