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Scratch that, found this on Stack Overflow. It adds it to the Categories, but also the Price at the top of the Single Product page.
add_filter( 'woocommerce_get_price_html', 'change_variable_products_price_display', 10, 2 );
function change_variable_products_price_display( $price, $product ) {
// Only for variable products type
if( ! $product->is_type('variable') ) return $price;
$prices = $product->get_variation_prices( true );
if ( empty( $prices['price'] ) )
return apply_filters( 'woocommerce_variable_empty_price_html', '', $product );
$min_price = current( $prices['price'] );
$max_price = end( $prices['price'] );
$prefix_html = '<span class="price-prefix">' . __('From: ') . '</span>';
$prefix = $min_price !== $max_price ? $prefix_html : ''; // HERE the prefix
return apply_filters( 'woocommerce_variable_price_html', $prefix . wc_price( $min_price ) . $product->get_price_suffix(), $product );
}
