diff --git a/timm/scheduler/cosine_lr.py b/timm/scheduler/cosine_lr.py
index e2c975fb..4eaaa86a 100644
--- a/timm/scheduler/cosine_lr.py
+++ b/timm/scheduler/cosine_lr.py
@@ -8,6 +8,7 @@ import logging
 import math
 import numpy as np
 import torch
+from typing import List
 
 from .scheduler import Scheduler
 
@@ -77,7 +78,7 @@ class CosineLRScheduler(Scheduler):
         else:
             self.warmup_steps = [1 for _ in self.base_values]
 
-    def _get_lr(self, t):
+    def _get_lr(self, t: int) -> List[float]:
         if t < self.warmup_t:
             lrs = [self.warmup_lr_init + t * s for s in self.warmup_steps]
         else:
diff --git a/timm/scheduler/multistep_lr.py b/timm/scheduler/multistep_lr.py
index 10f2fb50..e5db556d 100644
--- a/timm/scheduler/multistep_lr.py
+++ b/timm/scheduler/multistep_lr.py
@@ -53,7 +53,7 @@ class MultiStepLRScheduler(Scheduler):
         # assumes self.decay_t is sorted
         return bisect.bisect_right(self.decay_t, t + 1)
 
-    def _get_lr(self, t):
+    def _get_lr(self, t: int) -> List[float]:
         if t < self.warmup_t:
             lrs = [self.warmup_lr_init + t * s for s in self.warmup_steps]
         else:
diff --git a/timm/scheduler/plateau_lr.py b/timm/scheduler/plateau_lr.py
index 9f827157..e868bd5e 100644
--- a/timm/scheduler/plateau_lr.py
+++ b/timm/scheduler/plateau_lr.py
@@ -5,6 +5,7 @@ Adapts PyTorch plateau scheduler and allows application of noise, warmup.
 Hacked together by / Copyright 2020 Ross Wightman
 """
 import torch
+from typing import List
 
 from .scheduler import Scheduler
 
@@ -106,5 +107,5 @@ class PlateauLRScheduler(Scheduler):
             param_group['lr'] = new_lr
         self.restore_lr = restore_lr
 
-    def _get_lr(self, t: int) -> float:
+    def _get_lr(self, t: int) -> List[float]:
         assert False, 'should not be called as step is overridden'
diff --git a/timm/scheduler/poly_lr.py b/timm/scheduler/poly_lr.py
index 906f6acf..8875e15b 100644
--- a/timm/scheduler/poly_lr.py
+++ b/timm/scheduler/poly_lr.py
@@ -6,6 +6,7 @@ Hacked together by / Copyright 2021 Ross Wightman
 """
 import math
 import logging
+from typing import List
 
 import torch
 
@@ -73,7 +74,7 @@ class PolyLRScheduler(Scheduler):
         else:
             self.warmup_steps = [1 for _ in self.base_values]
 
-    def _get_lr(self, t):
+    def _get_lr(self, t: int) -> List[float]:
         if t < self.warmup_t:
             lrs = [self.warmup_lr_init + t * s for s in self.warmup_steps]
         else:
diff --git a/timm/scheduler/scheduler.py b/timm/scheduler/scheduler.py
index 3b1913f3..583357f7 100644
--- a/timm/scheduler/scheduler.py
+++ b/timm/scheduler/scheduler.py
@@ -1,6 +1,6 @@
 import abc
 from abc import ABC
-from typing import Any, Dict, Optional
+from typing import Any, Dict, List, Optional
 
 import torch
 
diff --git a/timm/scheduler/step_lr.py b/timm/scheduler/step_lr.py
index 70a45a70..c205d437 100644
--- a/timm/scheduler/step_lr.py
+++ b/timm/scheduler/step_lr.py
@@ -6,6 +6,8 @@ Hacked together by / Copyright 2020 Ross Wightman
 """
 import math
 import torch
+from typing import List
+
 
 from .scheduler import Scheduler
 
@@ -51,7 +53,7 @@ class StepLRScheduler(Scheduler):
         else:
             self.warmup_steps = [1 for _ in self.base_values]
 
-    def _get_lr(self, t):
+    def _get_lr(self, t: int) -> List[float]:
         if t < self.warmup_t:
             lrs = [self.warmup_lr_init + t * s for s in self.warmup_steps]
         else:
diff --git a/timm/scheduler/tanh_lr.py b/timm/scheduler/tanh_lr.py
index 48acc61b..94455302 100644
--- a/timm/scheduler/tanh_lr.py
+++ b/timm/scheduler/tanh_lr.py
@@ -8,6 +8,7 @@ import logging
 import math
 import numpy as np
 import torch
+from typing import List
 
 from .scheduler import Scheduler
 
@@ -75,7 +76,7 @@ class TanhLRScheduler(Scheduler):
         else:
             self.warmup_steps = [1 for _ in self.base_values]
 
-    def _get_lr(self, t):
+    def _get_lr(self, t: int) -> List[float]:
         if t < self.warmup_t:
             lrs = [self.warmup_lr_init + t * s for s in self.warmup_steps]
         else: