If the washing machine pipe is 1/2 inch or less and the water pipes closer to the water meter are fatter than 1/2 inch, it would be better to hook up the outside faucet to one of those using 5/8 inch pipe all the way, even if the length of new pipe is longer. This way the outside faucet has better pressure.
Do you get coverage you can count on? From the bag of fertilizer? From your lawn sprinklers?