diff --git a/MIGRATION.md b/MIGRATION.md
index d4c424d..fea9dd3 100644
--- a/MIGRATION.md
+++ b/MIGRATION.md
@@ -11,6 +11,7 @@
 ### New features
 
 - `LocaleId` is an enum of available locales.
+- Added the `Warmable` interface to features that can warm the CLDR cache.
 
 ### Backward Incompatible Changes
 
diff --git a/lib/CurrencyCollection.php b/lib/CurrencyCollection.php
index 502d217..b37a10a 100644
--- a/lib/CurrencyCollection.php
+++ b/lib/CurrencyCollection.php
@@ -11,6 +11,7 @@
 
 namespace ICanBoogie\CLDR;
 
+use Closure;
 use ICanBoogie\Accessor\AccessorTrait;
 
 use function array_combine;
@@ -36,7 +37,7 @@
  *
  * @property-read string[] $codes Alphabetic list of currency codes.
  */
-final class CurrencyCollection extends AbstractCollection
+final class CurrencyCollection extends AbstractCollection implements Warmable
 {
 	/**
 	 * @uses get_codes
@@ -70,10 +71,7 @@ public function __construct(
 	private function get_codes(): array
 	{
 		$make = function () {
-			$codes = array_keys($this->repository->fetch(
-				'numbers/en-001/currencies',
-				'main/en-001/numbers/currencies'
-			));
+			$codes = array_keys($this->fetch_currencies());
 
 			return array_combine($codes, $codes);
 		};
@@ -105,4 +103,18 @@ public function assert_defined(string $currency_code): void
 			throw new CurrencyNotDefined($currency_code);
 		}
 	}
+
+	private function fetch_currencies(): array
+	{
+		return $this->repository->fetch(
+			'numbers/en-001/currencies',
+			'main/en-001/numbers/currencies'
+		);
+	}
+
+	public function warm_up(Closure $progress): void
+	{
+		$progress("Warming up currencies");
+		$this->fetch_currencies();
+	}
 }
diff --git a/lib/Locale.php b/lib/Locale.php
index d42e08d..811bcab 100644
--- a/lib/Locale.php
+++ b/lib/Locale.php
@@ -11,8 +11,8 @@
 
 namespace ICanBoogie\CLDR;
 
+use Closure;
 use ICanBoogie\Accessor\AccessorTrait;
-use InvalidArgumentException;
 use LogicException;
 
 use function str_replace;
@@ -40,7 +40,7 @@
  * @property-read Units $units
  * @uses self::get_units()
  */
-class Locale extends AbstractSectionCollection
+class Locale extends AbstractSectionCollection implements Warmable
 {
 	use AccessorTrait;
 
@@ -94,6 +94,19 @@ public function offsetExists($offset): bool
 		return isset(self::OFFSET_MAPPING[$offset]);
 	}
 
+	/**
+	 * Warm up with locale relevant data.
+	 */
+	public function warm_up(Closure $progress): void
+	{
+        $progress("Warming up locale '{$this->id->value}':");
+
+		foreach (array_keys(self::OFFSET_MAPPING) as $offset) {
+            $progress("- $offset");
+			$this[$offset];
+		}
+	}
+
 	protected function path_for(string $offset): string
 	{
 		return str_replace('{locale}', $this->id->value, self::OFFSET_MAPPING[$offset][0]);
diff --git a/lib/Supplemental.php b/lib/Supplemental.php
index d104d93..85f2698 100644
--- a/lib/Supplemental.php
+++ b/lib/Supplemental.php
@@ -11,6 +11,7 @@
 
 namespace ICanBoogie\CLDR;
 
+use Closure;
 use ICanBoogie\Accessor\AccessorTrait;
 use ICanBoogie\CLDR\Supplemental\CurrencyData;
 
@@ -30,7 +31,7 @@
  * @property-read CurrencyData $currency_data
  * @uses self::get_currency_data()
  */
-final class Supplemental extends AbstractSectionCollection
+final class Supplemental extends AbstractSectionCollection implements Warmable
 {
 	/**
 	 * @uses get_currency_data
@@ -86,6 +87,16 @@ public function offsetExists($offset): bool
 		return isset(self::OFFSET_MAPPING[$offset]);
 	}
 
+	public function warm_up(Closure $progress): void
+	{
+        $progress("Warming up supplemental:");
+
+		foreach (array_keys(self::OFFSET_MAPPING) as $offset) {
+			$progress("- $offset");
+			$this[$offset];
+		}
+	}
+
 	protected function path_for(string $offset): string
 	{
 		return "core/supplemental/$offset";
diff --git a/lib/Warmable.php b/lib/Warmable.php
new file mode 100644
index 0000000..8ffab29
--- /dev/null
+++ b/lib/Warmable.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace ICanBoogie\CLDR;
+
+use Closure;
+
+/**
+ * An interface for components that can warm the CLDR cache.
+ */
+interface Warmable
+{
+	/**
+	 * @param Closure(string $progress):void $progress
+	 */
+	public function warm_up(Closure $progress): void;
+}
diff --git a/tests/CurrencyCollectionTest.php b/tests/CurrencyCollectionTest.php
index 7d25415..ba65840 100644
--- a/tests/CurrencyCollectionTest.php
+++ b/tests/CurrencyCollectionTest.php
@@ -75,4 +75,13 @@ public function test_assert_defined_success(): void
         $this->sut->assert_defined('EUR');
 		$this->assertTrue(true);
     }
+
+	public function test_warm_up(): void
+	{
+		$n = 0;
+
+		$this->sut->warm_up(function() use (&$n) { $n++; });
+
+		$this->assertEquals(1, $n);
+	}
 }
diff --git a/tests/LocaleTest.php b/tests/LocaleTest.php
index 3f691ba..d9613a1 100644
--- a/tests/LocaleTest.php
+++ b/tests/LocaleTest.php
@@ -183,4 +183,13 @@ public function test_context_transform(): void
 			)
 		);
 	}
+
+	public function test_warm_up(): void
+	{
+		$n = 0;
+
+		self::$locale->warm_up(function() use (&$n) { $n++; });
+
+		$this->assertEquals(30, $n);
+	}
 }
diff --git a/tests/SupplementalTest.php b/tests/SupplementalTest.php
index 52888ad..02ad1fc 100644
--- a/tests/SupplementalTest.php
+++ b/tests/SupplementalTest.php
@@ -121,4 +121,13 @@ public function test_should_throw_exception_in_attempt_to_unset_offset(): void
 	    $this->expectException(OffsetNotWritable::class);
         unset($s['timeData']);
     }
+
+	public function test_warm_up(): void
+	{
+		$n = 0;
+
+		self::$sut->warm_up(function() use (&$n) { $n++; });
+
+		$this->assertEquals(28, $n);
+	}
 }