diff --git a/src/components/ContactForm.astro b/src/components/ContactForm.astro
index 4f2548429..bac20d2e1 100644
--- a/src/components/ContactForm.astro
+++ b/src/components/ContactForm.astro
@@ -116,6 +116,7 @@ const { mode = 'page' } = Astro.props;
 				<input type="hidden" name="path" id="path" value="" />
 				<input type="hidden" name="_next" value="/contact-us-thanks/" />
 				<input type="text" name="_gotcha" style="display:none" />
+				<input type="hidden" class="form-rendered-at" value="" />
 			</div>
 			<div class="submit-button-container">
 				<button type="submit" class="submit-btn gtm_button" id="ContactUs_Submit">Submit</button>
@@ -306,6 +307,9 @@ const { mode = 'page' } = Astro.props;
 		// Set Formspree action
 		form.action = 'https://formspree.io/f/xrbnqnna';
 
+		const renderedAt = form.querySelector<HTMLInputElement>('.form-rendered-at');
+		if (renderedAt) renderedAt.value = String(Math.floor(Date.now() / 1000));
+
 		// Init select empty state
 		const select = form.querySelector<HTMLSelectElement>('select[name="subject"]');
 		if (select) {
@@ -324,6 +328,16 @@ const { mode = 'page' } = Astro.props;
 		form.addEventListener('submit', (e) => {
 			if (!validateForm(form)) {
 				e.preventDefault();
+				return;
+			}
+
+			const renderedAt = form.querySelector<HTMLInputElement>('.form-rendered-at');
+			if (renderedAt && renderedAt.value) {
+				const tooFast = Math.floor(Date.now() / 1000) - parseInt(renderedAt.value, 10) < 3;
+				if (tooFast) {
+					e.preventDefault();
+					form.innerHTML = '<p>Thank you! Your message has been received.</p>';
+				}
 			}
 		});